Seaborgium

Seaborgium, ₁₀₆Sg

Seaborgium
Pronunciation	/siːˈbɔːrɡiəm/ ⓘ ​(see-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) dubnium ← seaborgium → bohrium
Atomic number (Z)	106
Group	group 6
Period	period 7
Block	d-block
Electron configuration	[Rn] 5f14 6d4 7s2[1]
Electrons per shell	2, 8, 18, 32, 32, 12, 2
Physical properties
Phase at STP	solid (predicted)[2]
Density (near r.t.)	23–24 g/cm3 (predicted)[3][4]
Atomic properties
Oxidation states	0, (+3), (+4), (+5), +6[1][5] (parenthesized: prediction)
Ionization energies	1st: 757 kJ/mol 2nd: 1733 kJ/mol 3rd: 2484 kJ/mol (more) (all but first estimated)[1]
Atomic radius	empirical: 132 pm (predicted)[1]
Covalent radius	143 pm (estimated)[6]
Other properties
Natural occurrence	synthetic
Crystal structure	​body-centered cubic (bcc) (predicted)[2]
CAS Number	54038-81-2
History
Naming	after Glenn T. Seaborg
Discovery	Lawrence Berkeley National Laboratory (1974)
Isotopes of seaborgium v e
Main isotopes[7] Decay abun­dance half-life (t1/2) mode pro­duct 265Sg synth 8.5 s α 261Rf 265mSg synth 14.4 s α 261mRf 267Sg synth 80 s α17% 263Rf SF83% – 268Sg synth 13 s[8] SF Preview warning: Infobox Sg isotopes: Decay product missing; pn1, ps1 for "dm1=SF" cat#P 269Sg synth 14 min[9] α 265Rf 271Sg synth 31 s[10] α73% 267Rf SF27% Preview warning: Infobox Sg isotopes: Decay product missing; pn2, ps2 for "dm2=SF" cat#P
Category: Seaborgium view talk edit | references

Seaborgium is a synthetic chemical element; it has 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.^[9]

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 the 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.^[a]

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