| 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 | |||
|---|---|---|---|
| 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 | ||
Atomära egenskaper | |||
| Electronegativity (Pauling Scale) | |||
| Electron affinity | 66.6 kJ/mol | ||
| Ionization energies |
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Electron configuration | |||
| 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 | ||