Bohrium

Bohrium, ₁₀₇Bh

Bohrium
Pronunciation	/ˈbɔːriəm/ ​(BOR-ee-əm)
Mass number	[270] (unconfirmed: 278)
Bohrium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Re ↑ Bh ↓ (Uhu) seaborgium ← bohrium → hassium
Atomic number (Z)	107
Group	group 7
Period	period 7
Block	d-block
Electron configuration	[Rn] 5f14 6d5 7s2
Electrons per shell	2, 8, 18, 32, 32, 13, 2
Physical properties
Phase at STP	solid (predicted)
Density (near r.t.)	26–27 g/cm3 (predicted)
Atomic properties
Oxidation states	(+3), (+4), (+5), +7 (parenthesized: prediction)
Ionization energies	1st: 740 kJ/mol 2nd: 1690 kJ/mol 3rd: 2570 kJ/mol (more) (all but first estimated)
Atomic radius	empirical: 128 pm (predicted)
Covalent radius	141 pm (estimated)
Other properties
Natural occurrence	synthetic
Crystal structure	​hexagonal close-packed (hcp) (predicted)
CAS Number	54037-14-8
History
Naming	after Niels Bohr
Discovery	Gesellschaft für Schwerionenforschung (1981)
Isotopes of bohrium v e
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 267Bh synth 17 s α 263Db 270Bh synth 2.4 min α 266Db 271Bh synth 2.9 s α 267Db 272Bh synth 8.8 s α 268Db 274Bh synth 40 s α 270Db 278Bh synth 11.5 min? SF –
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Bohrium is a man made, radioactive chemical element that has an atomic number of 107 and an atomic mass of 270.

The element is named in honor of Niels Bohr.

Mendeleev predicted that Bohrium would exist, as he called the element eka-rhenium because of its location was near Rhenium in the Periodic Table. The chemistry of bohrium is like the chemistry of rhenium, but chemists are still researching it.

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1. ↑ Johnson, E.; Fricke, B.; Jacob, T.; Dong, C. Z.; Fritzsche, S.; Pershina, V. (2002). "Ionization potentials and radii of neutral and ionized species of elements 107 (bohrium) and 108 (hassium) from extended multiconfiguration Dirac–Fock calculations". The Journal of Chemical Physics. 116 (5): 1862–1868. Bibcode:2002JChPh.116.1862J. doi:10.1063/1.1430256.
2. 1 2 3 4 Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1.
3. 1 2 Östlin, A.; Vitos, L. (2011). "First-principles calculation of the structural stability of 6d transition metals". Physical Review B. 84 (11). Bibcode:2011PhRvB..84k3104O. doi:10.1103/PhysRevB.84.113104.
4. ↑ Gyanchandani, Jyoti; Sikka, S. K. (10 May 2011). "Physical properties of the 6 d -series elements from density functional theory: Close similarity to lighter transition metals". Physical Review B. 83 (17): 172101. doi:10.1103/PhysRevB.83.172101.{{cite journal}}: CS1 maint: article number as page number (link)
5. ↑ Kratz; Lieser (2013). Nuclear and Radiochemistry: Fundamentals and Applications (3rd ed.). p. 631.
6. ↑ Fricke, Burkhard (1975). "Superheavy elements: a prediction of their chemical and physical properties". Recent Impact of Physics on Inorganic Chemistry. Structure and Bonding. 21: 89–144. doi:10.1007/BFb0116498. ISBN 978-3-540-07109-9. Retrieved 4 October 2013.{{cite journal}}: CS1 maint: periodical has ISBN (link)
7. ↑ Chemical Data. Bohrium - Bh, Royal Chemical Society
8. ↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
9. ↑ FUSHE (2012). "Synthesis of SH-nuclei". Retrieved August 12, 2016.
10. ↑ Oganessian, Yuri Ts.; Abdullin, F. Sh.; Bailey, P. D.; et al. (2010-04-09). "Synthesis of a New Element with Atomic Number Z=117". Physical Review Letters. 104 (142502). American Physical Society. Bibcode:2010PhRvL.104n2502O. doi:10.1103/PhysRevLett.104.142502. PMID 20481935. (gives life-time of 1.3 min based on a single event; conversion to half-life is done by multiplying with ln(2).)
11. ↑ Hofmann, S.; Heinz, S.; Mann, R.; Maurer, J.; Münzenberg, G.; Antalic, S.; Barth, W.; Burkhard, H. G.; Dahl, L.; Eberhardt, K.; Grzywacz, R.; Hamilton, J. H.; Henderson, R. A.; Kenneally, J. M.; Kindler, B.; Kojouharov, I.; Lang, R.; Lommel, B.; Miernik, K.; Miller, D.; Moody, K. J.; Morita, K.; Nishio, K.; Popeko, A. G.; Roberto, J. B.; Runke, J.; Rykaczewski, K. P.; Saro, S.; Scheidenberger, C.; Schött, H. J.; Shaughnessy, D. A.; Stoyer, M. A.; Thörle-Popiesch, P.; Tinschert, K.; Trautmann, N.; Uusitalo, J.; Yeremin, A. V. (2016). "Review of even element super-heavy nuclei and search for element 120". The European Physics Journal A. 2016 (52). Bibcode:2016EPJA...52..180H. doi:10.1140/epja/i2016-16180-4.