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 | |||||||||||
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Symbol | Nh | ||||||||||
Atomic number | 113 | ||||||||||
Group | 13 | ||||||||||
Period | 7 | ||||||||||
Block | p | ||||||||||
Element category | Unknown | ||||||||||
Physical properties | |||||||||||
Phase at STP | Solid | ||||||||||
Density | 16 g/cm3 | ||||||||||
Atomic weight | 286 u | ||||||||||
Melting point | 700 K 426.85 °C 800.33 °F | ||||||||||
Boiling point | 1430 K 1156.85 °C 2114.33 °F | ||||||||||
Atomic properties | |||||||||||
Electronegativity (Pauling Scale) | |||||||||||
Electron affinity | 66.6 kJ/mol | ||||||||||
Oxidation states | (−1), (+1), (+3), (+5) (predicted) | ||||||||||
Ionization energies |
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Electron configuration | |||||||||||
Elektronkonfiguration (shorthand) | [Rn] 5f14 6d10 7s2 7p1 | ||||||||||
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p1 | ||||||||||
Electrons per shell | 2, 8, 18, 32, 32, 18, 3 | ||||||||||
History | |||||||||||
Discovered | 2003 | ||||||||||
Discovered by | RIKEN |