113Nh[286]
Nihonium (Nh)
Element 113 · Post-transition metal
Nihonium (Nh) is a chemical element with atomic number 113. It is classified as a post-transition metal in period 7, group 13 of the periodic table (the p-block). Its most stable known isotope has mass number 286 and its ground-state electron configuration is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹. Its properties are largely predicted, as only a few atoms have ever been produced.
Nihonium facts
| Atomic number (Z) | 113 |
|---|---|
| Symbol | Nh |
| Mass number of most stable isotope | [286] |
| Category | Post-transition metal |
| Group | 13 |
| Period | 7 |
| Block | p-block |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹ |
| Electronegativity (Pauling) | — |
| State at 20 °C | Unknown (synthetic) |
| Protons / electrons | 113 / 113 |
| Neutrons (most common isotope, approx.) | 173 |
| Molar mass | 286 g/mol |