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Nihonium

Element 113 · Post-transition metal

Specimen

Atomic number
113
Atomic mass
[286]
State at room temperature
Unknown
Melting point
Unknown
Boiling point
Unknown
Density
Unknown
Discovered
2004

Mass number of the longest-lived isotope, from IUPAC.1 Other physical data from PubChem.2

Can I eat it?

In food and water
Never made in amounts you could eat. Laboratories make nihonium one atom at a time. One method made about one atom in six months. 34

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The atom

Nh
ShellElectrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 32
6 (P) 18
7 (Q) outermost 3
Total113

Configuration [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p¹

5f ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓
6d ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓
7s ↑ ↓
7p ↑
A shell diagram: each ring is an electron shell and each dot is one electron. The nucleus holds 113 protons. The outermost shell is shown in red. Electrons do not travel on rings: they fill orbitals, regions where an electron is likely to be found. The boxes are those orbitals for the electrons outside the Rn core, with one arrow per electron. This configuration is a prediction; it has not been measured.

Related elements

Group 13
B Boron Al Aluminium Ga Gallium In Indium Tl Thallium

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Sources

  1. 1

    IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW), 2024. Radioactive Elements .

    Mass number and half-life of the longest-lived isotope of the 34 elements with no standard atomic weight.

  2. 2

    National Center for Biotechnology Information (PubChem), 2026. Periodic Table of Elements .

    Electron configuration, melting and boiling points, density and discovery year for all 118 elements.

  3. 3

    Contemporary Physics Education Project, Lawrence Berkeley National Laboratory, 2018. Nuclear Science: A Guide to the Nuclear Science Wall Chart, Chapter 8: The Search for Heavy Elements , p. 8-4 and 8-8.

    • The production of one isotope of element 113 with cold fusion reactions was at a production rate of about one atom per half-year.
  4. 4

    Los Alamos National Laboratory, Periodic Table of Elements, 2026. Nihonium .

    • Nihonium is only produced in laboratories and is not known to exist in nature.