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Nihonium (Nh)

From Wikipedia, the free encyclopediaNihonium is a chemical element with atomic number 113. It has a symbol Nh. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and is extremely radioactive; its most stable known isotope, nihonium-286, has a half-life of 20 seconds.

Nihonium in the periodic table

SymbolNh
Atomic number113
Group13
Period7
Blockp
Element categoryUnknown

Physical properties

Phase at STPSolid
Density16 g/cm3
Atomic weight286 u
Melting point700 K
426.85 °C
800.33 °F
Boiling point1430 K
1156.85 °C
2114.33 °F

Atomic properties

Electronegativity (Pauling Scale)
Electron affinity66.6 kJ/mol
Oxidation states(−1), (+1), (+3), (+5)
(predicted)
Ionization energies
1704.9 kJ/mol
22238.5 kJ/mol
33023.3 kJ/mol
44351.5 kJ/mol
55692.6 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f14 6d10 7s2 7p1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p1
Electrons per shell2, 8, 18, 32, 32, 18, 3

History

Discovered2003
Discovered byRIKEN
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