Nihonium (Nh)
Unknown / predicted · p-block · period 7 · group 13
Never seen.
Nihonium (symbol Nh) is chemical element number 113, a unknown / predicted in group 13, period 7 of the periodic table. Its standard atomic weight is (286) and its electron configuration is [Rn] 5f14 6d10 7s2 7p1. Its state at room temperature is unknown, and it is radioactive. The first element discovered in Asia; 'Nihon' is one Japanese name for Japan.
Properties
| Atomic number | 113 |
|---|---|
| Atomic mass | (286) |
| Category | Unknown / predicted |
| Block | p-block |
| Group · Period | 13 · 7 |
| Electron configuration | [Rn] 5f14 6d10 7s2 7p1 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 3 |
| State at 25 °C | unknown |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity (Pauling) | — |
| Radioactive | Yes — no stable isotope |
| Origin | synthetic |
| Discovered | 2004 · RIKEN (Japan) |
Key facts about Nihonium
- The first element discovered in Asia; 'Nihon' is one Japanese name for Japan.
- The RIKEN team detected just three atoms across nine years of experiments.
- Sits below thallium and is predicted to be a dense, soft metal.
- Longest-lived isotope lasts about ten seconds.
What Nihonium is used for
None — research only.
Where it sits in the periodic table
Nihonium is in group 13, period 7, of the p-block. Its electron configuration [Rn] 5f14 6d10 7s2 7p1 means its outermost shell holds 3 electrons, which is what places it here and explains much of its chemistry. See Nihonium on the interactive table →
Nihonium — frequently asked questions
What is Nihonium used for?
None — research only.
Is Nihonium radioactive?
Yes. Nihonium has no stable isotope, so every form of it is radioactive.
What is the electron configuration of Nihonium?
Nihonium has the electron configuration [Rn] 5f14 6d10 7s2 7p1, which is 2, 8, 18, 32, 32, 18, 3 electrons per shell.
What group and period is Nihonium in?
Nihonium is in group 13, period 7, in the p-block. Its outer shell holds 3 electrons.
Who discovered Nihonium?
Nihonium was discovered in 2004 by RIKEN (Japan).