Nihonium (Nh): electron configuration, atomic mass and facts
Nihonium (Nh) is element 113 of the periodic table, a post-transition metal (predicted) in period 7, group 13. Its electron configuration is [Rn] 5f14 6d10 7s2 7p1, with electrons arranged in shells 2, 8, 18, 32, 32, 18, 3, and its most stable isotope has mass number 286.
▶ Watch Nihonium’s electrons orbit in the interactive periodic tableNihonium at a glance
| Symbol | Nh |
|---|---|
| Atomic number | 113 |
| Atomic mass | [286] u (most stable isotope) |
| Category | Post-transition metal (predicted) |
| Group | 13 |
| Period | 7 |
| Block | p-block |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p1 |
| Noble-gas shorthand | [Rn] 5f14 6d10 7s2 7p1 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 3 |
| Outer-shell electrons | 3 |
| Electronegativity (Pauling) | — |
| State at 20 °C | Unknown (only a few atoms made) |
Where is Nihonium on the periodic table?
Nihonium is in period 7, group 13, in the p-block. The period number matches its 7 electron shells, and the block names the subshell its last electrons fill. In the same group, Thallium sits directly above it. Elements in one group have the same number of outer-shell electrons (3 here), which is why they react in similar ways.
How to work out the electron configuration of Nihonium
Put 113 electrons into subshells in order of rising energy, filling each before starting the next: 1s² (2), 2s² (4), 2p⁶ (10), 3s² (12), 3p⁶ (18), 4s² (20), 3d¹⁰ (30), 4p⁶ (36), 5s² (38), 4d¹⁰ (48), 5p⁶ (54), 6s² (56), 4f¹⁴ (70), 5d¹⁰ (80), 6p⁶ (86), 7s² (88), 5f¹⁴ (102), 6d¹⁰ (112), 7p¹ (113). In shorthand, [Rn] stands for the 86 electrons of radon, giving [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹.
Frequently asked questions
What is the electron configuration of Nihonium?
The electron configuration of Nihonium (Nh) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 7s2 7p1. In noble-gas shorthand it is written [Rn] 5f14 6d10 7s2 7p1.
How many electrons does Nihonium have in each shell?
Nihonium has 113 electrons arranged in shells as 2, 8, 18, 32, 32, 18, 3. It has 3 electrons in its outer shell.
What is the atomic mass of Nihonium?
Nihonium has no stable isotopes. Its most stable isotope has a mass number of 286.
Is Nihonium a metal?
Yes. Nihonium is a post-transition metal (predicted).
Explore nearby elements
More post-transition metals: Lead, Bismuth, Polonium, Flerovium, Moscovium, Livermorium. See all elements on the periodic table.