Bohrium

  • bohrium, 107bh
    bohrium
    pronunciationm/ (about this soundlisten) (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)
    seaborgiumbohriumhassium
    atomic number (z)107
    groupgroup 7
    periodperiod 7
    blockd-block
    element category  transition metal
    electron configuration[rn] 5f14 6d5 7s2[1][2]
    electrons per shell2, 8, 18, 32, 32, 13, 2
    physical properties
    phase at stpunknown phase (predicted)[3]
    density (near r.t.)37.1 g/cm3 (predicted)[2][4]
    atomic properties
    oxidation states(+3), (+4), (+5), +7[2][4] (parenthesized: prediction)
    ionization energies
    • 1st: 740 kj/mol
    • 2nd: 1690 kj/mol
    • 3rd: 2570 kj/mol
    • (more) (all but first estimated)[2]
    atomic radiusempirical: 128 pm (predicted)[2]
    covalent radius141 pm (estimated)[5]
    other properties
    natural occurrencesynthetic
    crystal structurehexagonal close-packed (hcp)
    hexagonal close-packed crystal structure for bohrium

    (predicted)[3]
    cas number54037-14-8
    history
    namingafter niels bohr
    discoverygesellschaft für schwerionenforschung (1981)
    main isotopes of bohrium
    iso­tope abun­dance half-life (t1/2) decay mode pro­duct
    267bh syn 17 s α 263db
    270bh syn 1 min α 266db
    271bh syn 1.5 s[6] α 267db
    272bh syn 11 s α 268db
    274bh syn 44 s[7] α 270db


    278bh[8] syn 11.5 min? sf
    category category: bohrium
    | references

    bohrium is a synthetic chemical element with the symbol bh and atomic number 107. it is named after danish physicist niels bohr. as a synthetic element, it can be created in a laboratory but is not found in nature. all known isotopes of bohrium are extremely radioactive; the most stable known isotope is 270bh with a half-life of approximately 61 seconds, though the unconfirmed 278bh may have a longer half-life of about 690 seconds.

    in the periodic table, it is a d-block transactinide element. it is a member of the 7th period and belongs to the group 7 elements as the fifth member of the 6d series of transition metals. chemistry experiments have confirmed that bohrium behaves as the heavier homologue to rhenium in group 7. the chemical properties of bohrium are characterized only partly, but they compare well with the chemistry of the other group 7 elements.

  • history
  • isotopes
  • predicted properties
  • experimental chemistry
  • references
  • external links

Bohrium, 107Bh
Bohrium
Pronunciationm/ (About this soundlisten) (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)
seaborgiumbohriumhassium
Atomic number (Z)107
Groupgroup 7
Periodperiod 7
Blockd-block
Element category  Transition metal
Electron configuration[Rn] 5f14 6d5 7s2[1][2]
Electrons per shell2, 8, 18, 32, 32, 13, 2
Physical properties
Phase at STPunknown phase (predicted)[3]
Density (near r.t.)37.1 g/cm3 (predicted)[2][4]
Atomic properties
Oxidation states(+3), (+4), (+5), +7[2][4] (parenthesized: prediction)
Ionization energies
  • 1st: 740 kJ/mol
  • 2nd: 1690 kJ/mol
  • 3rd: 2570 kJ/mol
  • (more) (all but first estimated)[2]
Atomic radiusempirical: 128 pm (predicted)[2]
Covalent radius141 pm (estimated)[5]
Other properties
Natural occurrencesynthetic
Crystal structurehexagonal close-packed (hcp)
Hexagonal close-packed crystal structure for bohrium

(predicted)[3]
CAS Number54037-14-8
History
Namingafter Niels Bohr
DiscoveryGesellschaft für Schwerionenforschung (1981)
Main isotopes of bohrium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
267Bh syn 17 s α 263Db
270Bh syn 1 min α 266Db
271Bh syn 1.5 s[6] α 267Db
272Bh syn 11 s α 268Db
274Bh syn 44 s[7] α 270Db


278Bh[8] syn 11.5 min? SF
Category Category: Bohrium
| references

Bohrium is a synthetic chemical element with the symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. As a synthetic element, it can be created in a laboratory but is not found in nature. All known isotopes of bohrium are extremely radioactive; the most stable known isotope is 270Bh with a half-life of approximately 61 seconds, though the unconfirmed 278Bh may have a longer half-life of about 690 seconds.

In the periodic table, it is a d-block transactinide element. It is a member of the 7th period and belongs to the group 7 elements as the fifth member of the 6d series of transition metals. Chemistry experiments have confirmed that bohrium behaves as the heavier homologue to rhenium in group 7. The chemical properties of bohrium are characterized only partly, but they compare well with the chemistry of the other group 7 elements.