Element 113 · Unknown properties
Nihonium (Nh) — Element 113
Japanese Nihon — Japan
Nihonium (Nh) is a chemical element with unknown bulk chemical properties in Period 7, Group 13 of the periodic table with atomic number 113, standard atomic weight [286] u, and ground-state electron configuration [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹. At standard temperature and pressure it is classified as a short-lived synthetic nuclide with 3 valence electrons.
Research only
What are the atomic properties and physical constants of Nihonium?
Reference constants compiled from IUPAC standard atomic weights, the NIST Atomic Spectra Database, and the CRC Handbook.
- Atomic number (Z)
- 113
- Standard atomic mass
- [286] u
- Chemical family
- Unknown properties
- Ground-state configuration
- [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 3
- Valence electrons
- 3
- Common ion charges / oxidation states
- —
- Phase at STP
- Synthetic
- Pauling electronegativity
- —
- First ionization energy
- —
- Atomic radius
- —
- Melting point
- —
- Boiling point
- —
- Discovery year
- 2004
- Table coordinate
- Period 7, Group 13
- Radioactivity
- Radioactive (no stable isotopes)
How are electrons arranged across Nihonium’s shells?
A neutral Nihonium atom contains 113 electrons distributed across 7 occupied principal energy shells ([Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹). The table below compares Nihonium’s shell occupancy against each shell’s theoretical 2n² capacity.
| Principal Shell (n) | Spectroscopic Letter | Electrons in Nh | Max Shell Capacity (2n²) |
|---|---|---|---|
| n = 1 | K | 2 e⁻ | 2 e⁻ |
| n = 2 | L | 8 e⁻ | 8 e⁻ |
| n = 3 | M | 18 e⁻ | 18 e⁻ |
| n = 4 | N | 32 e⁻ | 32 e⁻ |
| n = 5 | O | 32 e⁻ | 50 e⁻ |
| n = 6 | P | 18 e⁻ | 72 e⁻ |
| n = 7 | Q | 3 e⁻ | 98 e⁻ |
Frequently Asked Questions about Nihonium (Nh)
What is the atomic mass and atomic number of Nihonium (Nh)?
Nihonium (Nh) has atomic number Z = 113 (113 protons in its nucleus) and an IUPAC standard atomic weight of [286] u. It sits in Period 7, Group 13 and is classified as an unknown properties.
What is the ground-state electron configuration of Nihonium?
The neutral ground-state electron configuration of Nihonium (Z = 113) is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹. Across its 7 occupied principal shells (n = 1 to n = 7), the electrons per shell are 2, 8, 18, 32, 32, 18, 3, with 3 valence electrons participating in bonding.
What are the common ion charges and electronegativity of Nihonium?
Nihonium has no common simple monatomic ion charges under standard classroom conditions. Its Pauling electronegativity is — and its first ionization energy is —.
When was Nihonium discovered and what is it used for?
Nihonium was discovered in 2004 (Japanese Nihon — Japan). Research only
How does Nihonium compare to neighboring elements?
Other unknown properties elements: