Nihonium (symbol Nh, atomic number 113) is the first element discovered in Asia, named after Japan. It is classified as a post-transition metal and sits in group 13, period 7 of the periodic table.
Overview
Nihonium is the chemical element with atomic number 113 and the symbol Nh. With a standard atomic weight of [286], it is a post-transition metal. In the periodic table it occupies group 13 and period 7, and under standard conditions it is normally a solid. Nihonium is the first element discovered in Asia, named after Japan.
Atomic structure
An atom of Nihonium has 113 protons in its nucleus and, when neutral, 113 electrons arranged in the configuration [Rn] 5f14 6d10 7s2 7p1. Nihonium has no stable isotope; the value [286] refers to the mass number of its most stable or most commonly produced isotope.
Discovery and place in the table
Nihonium was discovered in 2004 by RIKEN. It follows Copernicium (Cn) and precedes Flerovium (Fl) in order of atomic number.
| Atomic number | 113 |
|---|---|
| Symbol | Nh |
| Atomic mass | [286] |
| Category | Post-transition metal |
| Group | 13 |
| Period | 7 |
| Electron configuration | [Rn] 5f14 6d10 7s2 7p1 |
| Phase at STP | Solid |
| Discovered | 2004 (RIKEN) |