Seaborgium

  • seaborgium, 106sg
    seaborgium
    pronunciationm/ (about this soundlisten) (bor-ghee-əm)
    mass number[269]
    seaborgium 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
    w

    sg

    (uhn)
    dubniumseaborgiumbohrium
    atomic number (z)106
    groupgroup 6
    periodperiod 7
    blockd-block
    element category  transition metal
    electron configuration[rn] 5f14 6d4 7s2[1]
    electrons per shell2, 8, 18, 32, 32, 12, 2
    physical properties
    phase at stpsolid (predicted)[2]
    density (near r.t.)35.0 g/cm3 (predicted)[1][3]
    atomic properties
    oxidation states0, (+3), (+4), (+5), +6[1][3] (parenthesized: prediction)
    ionization energies
    • 1st: 757 kj/mol
    • 2nd: 1733 kj/mol
    • 3rd: 2484 kj/mol
    • (more) (all but first estimated)[1]
    atomic radiusempirical: 132 pm (predicted)[1]
    covalent radius143 pm (estimated)[4]
    other properties
    natural occurrencesynthetic
    crystal structurebody-centered cubic (bcc)
    body-centered cubic crystal structure for seaborgium

    (predicted)[2]
    cas number54038-81-2
    history
    namingafter glenn t. seaborg
    discoverylawrence berkeley national laboratory (1974)
    main isotopes of seaborgium
    iso­tope abun­dance half-life (t1/2) decay mode pro­duct
    265sg syn 8.9 s α 261rf
    265msg syn 16.2 s α 261mrf
    267sg syn 1.4 min 17% α 263rf
    83% sf
    269sg syn 14 min[5] α 265rf
    271sg syn 1.6 min 67% α 267rf
    33% sf
    category category: seaborgium
    | references

    seaborgium is a synthetic chemical element with the symbol sg and atomic number 106. it is named after the american nuclear chemist glenn t. seaborg. as a synthetic element, it can be created in a laboratory but is not found in nature. it is also radioactive; the most stable known isotope, 269sg, has a half-life of approximately 14 minutes.[5]

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

    in 1974, a few atoms of seaborgium were produced in laboratories in the soviet union and in the united states. the priority of the discovery and therefore the naming of the element was disputed between soviet and american scientists, and it was not until 1997 that international union of pure and applied chemistry (iupac) established seaborgium as the official name for the element. it is one of only two elements named after a living person at the time of naming, the other being oganesson, element 118.

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

Seaborgium, 106Sg
Seaborgium
Pronunciationm/ (About this soundlisten) (BOR-ghee-əm)
Mass number[269]
Seaborgium 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
W

Sg

(Uhn)
dubniumseaborgiumbohrium
Atomic number (Z)106
Groupgroup 6
Periodperiod 7
Blockd-block
Element category  Transition metal
Electron configuration[Rn] 5f14 6d4 7s2[1]
Electrons per shell2, 8, 18, 32, 32, 12, 2
Physical properties
Phase at STPsolid (predicted)[2]
Density (near r.t.)35.0 g/cm3 (predicted)[1][3]
Atomic properties
Oxidation states0, (+3), (+4), (+5), +6[1][3] (parenthesized: prediction)
Ionization energies
  • 1st: 757 kJ/mol
  • 2nd: 1733 kJ/mol
  • 3rd: 2484 kJ/mol
  • (more) (all but first estimated)[1]
Atomic radiusempirical: 132 pm (predicted)[1]
Covalent radius143 pm (estimated)[4]
Other properties
Natural occurrencesynthetic
Crystal structurebody-centered cubic (bcc)
Body-centered cubic crystal structure for seaborgium

(predicted)[2]
CAS Number54038-81-2
History
Namingafter Glenn T. Seaborg
DiscoveryLawrence Berkeley National Laboratory (1974)
Main isotopes of seaborgium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
265Sg syn 8.9 s α 261Rf
265mSg syn 16.2 s α 261mRf
267Sg syn 1.4 min 17% α 263Rf
83% SF
269Sg syn 14 min[5] α 265Rf
271Sg syn 1.6 min 67% α 267Rf
33% SF
Category Category: Seaborgium
| references

Seaborgium is a synthetic chemical element with the symbol Sg and atomic number 106. It is named after the American nuclear chemist Glenn T. Seaborg. As a synthetic element, it can be created in a laboratory but is not found in nature. It is also radioactive; the most stable known isotope, 269Sg, has a half-life of approximately 14 minutes.[5]

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

In 1974, a few atoms of seaborgium were produced in laboratories in the Soviet Union and in the United States. The priority of the discovery and therefore the naming of the element was disputed between Soviet and American scientists, and it was not until 1997 that International Union of Pure and Applied Chemistry (IUPAC) established seaborgium as the official name for the element. It is one of only two elements named after a living person at the time of naming, the other being oganesson, element 118.