113
Nh
Nihonium
286
Nihonium (Nh)
Post-Transition MetalGroup 13Period 7p-block-blockRadioactive
Nihonium 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.
Latin name: Nihonium
Atomic Number
113
Atomic Mass
286 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹ (predicted)
General
SymbolNh
Atomic Number113
Atomic Mass286 g/mol
CategoryPost-Transition Metal
Group13
Period7
Blockp-block
Electron Configuration[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹ (predicted)
Valence Electrons13
Colourunknown (predicted metallic)
Physical Properties
Phase (STP)Solid (predicted)
Densitypredicted ~16 g/cm3
Melting Pointpredicted ~700 K
Boiling Pointpredicted ~1400 K
Atomic Properties
Oxidation States+1, +3
Ion ChargeNh+/Nh3+
Nuclear & Hazards
RadioactiveYes
Half-life20 seconds (Nh-286)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year2003
Discovered ByRiken (Japan) with collaborators
Country of DiscoveryJapan
Isotopes of Nihonium
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Nh-284 | — | ~0.48 seconds | α |
| Nh-286 | — | ~9.5 seconds | α |