Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Neutrons and protons, commonly callednucleons, are bound together in the atomic nucleus, where they account for 99.9 percent of the atoms mass. A neutron star has such an intense gravitational field and high temperature that you could not survive a close encounter of any kind. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Strontiumis a chemical element withatomic number38which means there are 38 protons and 38 electrons in the atomic structure. Symbol:Bi. Californiumis a chemical element withatomic number98which means there are 98 protons and 98 electrons in the atomic structure. See answer (1) Copy == The element bismuth has 83 protons. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Bismuthis a chemical element with atomic number83which means there are 83 protons and 83 electrons in the atomic structure. Thechemical symbolfor Ytterbium isYb. Thechemical symbolfor Astatine isAt. Owing to the very high atom utilization. Atomic nuclei consist of protons and neutrons, which attract each other throughthenuclear force, while protons repel each other viatheelectric forcedue to their positive charge. Neonis a chemical element withatomic number10which means there are 10 protons and 10 electrons in the atomic structure. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Nobeliumis a chemical element withatomic number102which means there are 102 protons and 102 electrons in the atomic structure. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Zirconium is widely used as a cladding for nuclear reactor fuels. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. There are only certain combinations of neutrons and protons, which formsstable nuclei. Bismuth has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic weight can be given as 208.980 40 (1).Although bismuth-209 is now known to be radioactive, it has classically been considered to be a stable isotope because it has a half-life of approximately 2.0110 19 years, which is more . Although classified as a rare earth element, samarium is the 40th most abundant element in the Earths crust and is more common than such metals as tin. Thechemical symbolfor Sulfur isS. Sulfur is abundant, multivalent, and nonmetallic. Chlorineis a chemical element withatomic number17which means there are 17 protons and 17 electrons in the atomic structure. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Thechemical symbolfor Bismuth isBi. The atomic number of an element is equal to the number of protons and electrons in that element. Ut enim ad minim. Although the term is not used in the scientific literature either for a condensed form of matter, or as an element, there have been reports that, besides the free neutron, there may exist two bound forms of neutrons without protons. Edit Report an issue 30 seconds. 113Cd has specific absorption cross-section. Bismuth is the 83rd element of the periodic table so its atomic number is 83. There are two reasons for the difference between mass number and isotopic mass, known as themass defect: Note that, it was found therest mass of an atomic nucleusis measurably smaller thanthe sum of the rest masses of its constituentprotons,neutronsand electrons. Arsenic is a metalloid. The nucleus consists of 83 protons (red) and 126 neutrons (blue). the commitment trust theory of relationship marketing pdf; cook county sheriff police salary; pantene truly natural discontinued Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. In fact their absorption cross-sections are the highest among all stable isotopes. Therefore, a bromine atom has thirty-five protons and thirty-five electrons. Q. It is the heaviest essential mineral nutrient. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). As a result, as the number of protons increases,an increasing ratio of neutrons to protons is neededto form a stable nucleus. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Decay properties Francium is a highly radioactive metal that decays into astatine, radium, and radon. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Thechemical symbolfor Gold isAu. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Terbiumis a chemical element withatomic number65which means there are 65 protons and 65 electrons in the atomic structure. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrs Manuel (1801) and Sefstrm, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-mile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segr, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Mller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Isotopic Distributions. If you have an atom of bismuth that has been ionized (changed the number of electrons) and become 209Bi5+? It occurs on Earth as the decay product of various heavier elements. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). The number of neutrons in an atom can be determined by the difference between the atomic mass and . There are 83 protons, as the atomic number of bismuth is 83. The difference is a measure of thenuclear binding energywhich holds the nucleus together. This type of ion is called an anion. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. This cookie is set by GDPR Cookie Consent plugin. Francium is an alkali metal, that has one valence electron. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. This is a tiny, dense region at the center of the atom. The bulk properties of astatine are not known with any certainty. Rutheniumis a chemical element withatomic number44which means there are 44 protons and 44 electrons in the atomic structure. == The element bismuth has 83 protons. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. It is the fifth most abundant element in Earths crust and the third most abundant metal, after iron and aluminium. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. As to neutrons, the number of neutrons in bismuth atoms can vary. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Thechemical symbolfor Nickel isNi. You also have the option to opt-out of these cookies. Bariumis a chemical element withatomic number56which means there are 56 protons and 56 electrons in the atomic structure. For example, carbon atoms have six protons, hydrogen atoms have one and oxygen atoms have eight. Only two stable nuclides have fewer neutrons than protons: hydrogen-1 and helium-3. Manage Settings Chromiumis a chemical element withatomic number24which means there are 24 protons and 24 electrons in the atomic structure. At 0.099%, phosphorus is the most abundant pnictogen in the Earths crust. What is causing the plague in Thebes and how can it be fixed? Bismuth is a chemical element with atomic number 83 which means there are 83 protons in its nucleus. Nuclides that have the same neutron number but a different proton number are called isotones. linalove203 linalove203 09/14/2016 Mathematics Middle School answered How many protons are in an atom of bismuth 2 See answers Advertisement First of all, just getting onto the surface of the neutron star would be problematic. Vanadiumis a chemical element withatomic number23which means there are 23 protons and 23 electrons in the atomic structure. Neptuniumis a chemical element withatomic number93which means there are 93 protons and 93 electrons in the atomic structure. Electron configuration The arrangements of electrons above the last closed shell noble gas. It could be part of the main body, but then the periodic table would be rather long and cumbersome. 2.1 Electrons, Protons, Neutrons, and Atoms. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. The protonsexist in the nuclei of typical atoms, along with their neutral counterparts, the neutrons. is a rare earth element with a metallic silver luster. My Blog how many protons are in an atom of bismuth Radiumis a chemical element withatomic number88which means there are 88 protons and 88 electrons in the atomic structure. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. The upper limit of mass for a neutron star is called the TolmanOppenheimerVolkoff limit and is generally held to be around 2.1 M , but a recent estimate puts the upper limit at 2.16 M . Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. Mercuryis a chemical element withatomic number80which means there are 80 protons and 80 electrons in the atomic structure. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge a cation, which combines with anions to form salts. In the universe, protons are abundant, making upabout halfof all visible matter. Cr this has 24 protons. Calciumis a chemical element withatomic number20which means there are 20 protons and 20 electrons in the atomic structure. Bismuth oxychloride (BiOCl) is sometimes used in cosmetics, as a pigment in paint for eye shadows, hair sprays and nail polishes. Thechemical symbolfor Argon isAr. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. In contrast, a neutron contains no protons and is electrically neutral, so Z = 0. Bismuth is a chemical element with the symbol Bi and atomic number 83. True. Thechemical symbolfor Praseodymium isPr. Where are makes up the nucleus of an atom? Silveris a chemical element withatomic number47which means there are 47 protons and 47 electrons in the atomic structure. 2) You may not distribute or commercially exploit the content, especially on another website. Compounds of bismuth are used in lubricating greases, thermoelectric materials, infrared spectrometers. How many protons are in an atom of bismuth - 14477050. Similarly, adding electrons results in a negative oxidation state. Thechemical symbolfor Cobalt isCo. Cobalt is found in the Earths crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Thechemical symbolfor Actinium isAc. 3 How many protons and neutrons does bismuth have? Mass numbers of typical isotopes of Bismuthare209. There are only certain combinations of neutrons and protons, which formsstable nuclei. Thechemical symbolfor Zirconium isZr. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Greg RobsonCC BY 20. What is error code E01-5 on Toyota forklift. Note that, eachelementmay contain moreisotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Greg RobsonCC BY 20. Platinumis a chemical element withatomic number78which means there are 78 protons and 78 electrons in the atomic structure. A property closely related to an atom's mass number is its atomic mass. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Feel free to ask a question, leave feedback or take a look at one of our articles. Bismuth alloys are used in soldering, thermocouple materials and magnetic memory devices. The Cookies Statement is part of our Privacy Policy. Potassiumis a chemical element withatomic number19which means there are 19 protons and 19 electrons in the atomic structure. These other "flavors" of bismuth are its isotopes, and the numbers of . === ===. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Thechemical symbolfor Molybdenum isMo. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Since bismuth bismuth 's atomic number is 83 83, Bi Bi has 83 83 protons. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Thechemical symbolfor Fermium isFm. Nickelis a chemical element withatomic number28which means there are 28 protons and 28 electrons in the atomic structure. An ion of an atom is one in which the number of protons and electrons is not the same. Lutetiumis a chemical element withatomic number71which means there are 71 protons and 71 electrons in the atomic structure. Sodium is a soft, silvery-white, highly reactive metal. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. When an atom gains electrons this results in a negative charge. The atomic number of an element is equal to the number of protons and electrons in that element. Zirconiumis a chemical element withatomic number40which means there are 40 protons and 40 electrons in the atomic structure. Thechemical symbolfor Boron isB. Bismuth atoms have 83 electrons and the shell structure is 2.8. Xenon is a colorless, dense, odorless noble gas found in the Earths atmosphere in trace amounts. What is the isotopic symbol of bismuth 213? Both protons and neutrons consist of one up quark and two down quarks. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Routing number of commercial bank of Ethiopia? There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Its atomic number is 14 and its atomic mass is 28. Both are very slightly radioactive. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Europiumis a chemical element withatomic number63which means there are 63 protons and 63 electrons in the atomic structure. The size and mass of atoms are so small that the use of normal measuring units, while possible, is often inconvenient. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Therefore this resulting atomic mass is calculated from naturally-occurring isotopes and their abundance. In . Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do In the periodic table, potassium is one of the alkali metals. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Bismuth Element information, properties and uses | Periodic Table. Theconfiguration of these electronsfollows from the principles of quantum mechanics. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. Platinum is one of the least reactive metals. Perkataan berlawan bagi masuk ia, Cara Nak Buat Bentuk Love Malaysia Guna Kapas, Contoh Contoh Soalan Yang Ditanya Semasa Temuduga Kastam. We and our partners use cookies to Store and/or access information on a device. Rheniumis a chemical element withatomic number75which means there are 75 protons and 75 electrons in the atomic structure. Thechemical symbolfor Nobelium isNo. Also to help understand this concept there is a chart of the nuclides, known as a Segre chart. Protons carry a positive electrical change, while electrons are negatively charged, and neutrons are neutral. Number of electrons in shells. Bismuth oxide (Bi 2 O 3) Bismuth subgallate (C 7 H 5 BiO 6) Bismuth subsalicylate (C 7 H 5 BiO 4) Bismuth telluride (Bi 2 Te 3) Interesting facts: In the universe, neutrons are abundant, making upmore than halfof all visible matter. Lead is widely used as a gamma shield. What characteristics allow plants to survive in the desert? The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. Its atomic number is 92 and its atomic mass is 238 (92 + 146). Atomic Mass Number Does it conserve in a nuclear reaction? Mercury is commonly known as quicksilver and was formerly named hydrargyrum. 5 What element has 53 protons and 74 neutrons? Actiniumis a chemical element withatomic number89which means there are 89 protons and 89 electrons in the atomic structure. how many protons are in an atom of bismuth. Bromineis a chemical element withatomic number35which means there are 35 protons and 35 electrons in the atomic structure. It should be noted that all of these decay pathways may be accompanied bythe subsequent emission ofgamma radiation. Whats the heaviest thing in the universe? Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. The current IUPAC Gold Book definition of oxidation state is: Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. Thechemical symbolfor Vanadium isV. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Protons are found in the nucleus of the atom. The chemical symbol for Bismuth is Bi. Thechemical symbolfor Thulium isTm. Thechemical symbolfor Dysprosium isDy. Therefore we will have 83 protons. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Holmium is a relatively soft and malleable silvery-white metal. Therefore, the number of electrons in neutral atom of Bismuth is 83. 83 protons in their nucleus, are radioactive. 2.1 Electrons, Protons, Neutrons, and Atoms. Leadis a chemical element withatomic number82which means there are 82 protons and 82 electrons in the atomic structure. Tin is a post-transition metal in group 14 of the periodic table. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. The atomic number is equal to 24 26 Neutrons. How many electrons does 1 bismuth atom have? Bismuth atom is a pnictogen and a metal atom.5.3Related Element. I don't think I can give my undivided attention and time for this position.7. These objects contain even more material than the sun, but they are only about 10 miles across the size of a city. Neutrons have approximately the same mass as protons but no charge. Analytical cookies are used to understand how visitors interact with the website. Under standard conditions, it is the lightest metal and the lightest solid element. Too many electrons orbiting the atom pull protons away from the neutrons in the center. [Xe] 6s2 for barium). If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. An ion has an unequal number of protons and electrons. Note that each element may contain more isotopes. Arsenicis a chemical element withatomic number33which means there are 33 protons and 33 electrons in the atomic structure. Thechemical symbolfor Silicon isSi. Manage Settings Thechemical symbolfor Americium isAm. Thechemical symbolfor Tin isSn. Ceriumis a chemical element withatomic number58which means there are 58 protons and 58 electrons in the atomic structure. 36 48 84 120. Remember that it's the number of protons in an element that determines the atomic number of that element.. 8 devine street north haven, ct what is berth preference in irctc how many protons are in an atom of bismuth. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Rubidiumis a chemical element withatomic number37which means there are 37 protons and 37 electrons in the atomic structure. Technetiumis a chemical element withatomic number43which means there are 43 protons and 43 electrons in the atomic structure. In the periodic table, the elements are listed in order of increasing atomic number Z. 4. number of electrons = atomic number. Titaniumis a chemical element withatomic number22which means there are 22 protons and 22 electrons in the atomic structure. Neutron number is rarely written explicitly in nuclide symbol notation, but appears as a subscript to the right of the element symbol. Name:Bismuth. A freshly exposed surface of pure copper has a reddish-orange color. Remember that it's the number of protons in an element that determines the atomic number of that element. Iodine has 53 protons and 74 neutrons. That's its atomic number. Therefore, a cesium atom has fifty-five protons and fifty-five electrons. 2 How many atoms are in an atom of bismuth? Berylliumis a chemical element withatomic number4which means there are 4 protons and 4 electrons in the atomic structure. The atomic number equals the number of protons in an atom of an element. It must be noted, especially nuclear cross-sections may vary by many orders from nuclide with the neutron number N to nuclide with the neutron number N+1. This fact has key implications for the building up of the periodic table of elements. The difference between the neutron number and the atomic number is known as theneutron excess: D = N Z = A 2Z. and Gay-Lussac, L.-J. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. mac miller faces indie exclusive. In nuclear reactors, promethium equilibrium exists in power operation. Thechemical symbolfor Thorium isTh. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. If you continue to use this site we will assume that you are happy with it. The name xenon for this gas comes from the Greek word [xenon], neuter singular form of [xenos], meaning foreign(er), strange(r), or guest. Bombarding Bismuth-209 with iron-58 nuclei 20983 Bi + 5626 Fe 264109 Mt + 1 n. San Vicente, Pili, Camarines Sur AY 2022 - 2023 the timeline . The cookies is used to store the user consent for the cookies in the category "Necessary". Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Hydrogenis a chemical element withatomic number1which means there are 1 protons and 1 electrons in the atomic structure. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. The metal is found in the Earths crust in the pure, free elemental form (native silver), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. How many electrons, protons, and neutrons are there in each of the following atoms? Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Bismuth oxide is used as a yellow pigment for cosmetics and paints. Can a nuclear winter reverse global warming? Yttriumis a chemical element withatomic number39which means there are 39 protons and 39 electrons in the atomic structure. Thechemical symbolfor Californium isCf. montaukett tribe membership. See also:Atomic Mass Number Does it conserve in a nuclear reaction? Its properties are thus intermediate between those of chlorine and iodine. This cookie is set by GDPR Cookie Consent plugin. The number of electrons in each elements electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. Therefore, a bismuth atom has eighty-three protons and eighty-three electrons. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Thechemical symbolfor Aluminum isAl. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Thechemical symbolfor Arsenic isAs. Sodiumis a chemical element withatomic number11which means there are 11 protons and 11 electrons in the atomic structure. The excess neutrons act somewhat like nuclear glue. Astatineis a chemical element withatomic number85which means there are 85 protons and 85 electrons in the atomic structure. Each nuclide is denoted by chemical symbol of the element (this specifies Z) with tha atomic mass number as supescript. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z 1) negative electrons in the atom. Gold is a transition metal and a group 11 element. Thechemical symbolfor Krypton isKr. Its extreme rarity in the Earths crust, comparable to that of platinum. Since the electrons are very light compared to the alpha particle their influence can be neglected so the atom can be seen as a heavy sphere of positive charge. Nuclear energy is produced when an atom's nucleus is split into smaller nuclei by the process called fission. Thechemical symbolfor Yttrium isY. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a rare-earth element. That's its atomic number. The cookie is used to store the user consent for the cookies in the category "Other. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Pure radium is silvery-white alkaline earth metal. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). If there are too many or too few neutrons for a given number of protons, the resulting nucleus is not stable and it undergoesradioactive decay. This chart shows a plot of the known nuclides as a function of their atomic and neutron numbers. The number of protons in the nucleus of the atom is equal to the atomic number (Z). Cobaltis a chemical element withatomic number27which means there are 27 protons and 27 electrons in the atomic structure. Atomic nuclei consist of protons and neutrons, which attract each other throughthe nuclear force, while protons repel each other viathe electric forcedue to their positive charge. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Cadmiumis a chemical element withatomic number48which means there are 48 protons and 48 electrons in the atomic structure. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Mass numbers of typical isotopes ofBismuthare209. how many protons are in an atom of bismuthmike dean referee wife | Thechemical symbolfor Curium isCm. Magnesium-24, 24Mg Tin-119, 119Sn Radon is a radioactive, colorless, odorless, tasteless noble gas. This unnamed intergalactic goliath is the current heavy-weight champion.