Atomic number 113

Nh

Nihonium

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  • Nh
  • Nh
  • + phase
  • − phase
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113 electrons in 7 shells: 2, 8, 18, 32, 32, 18, 3.

Shells are a teaching model: an electron does not travel on a ring at a fixed distance.

Bohr model of the nihonium atom: a nucleus drawn in the CPK colour for nihonium, surrounded by 7 electron shells drawn as rings holding 2, 8, 18, 32, 32, 18 and 3 electrons. The viewer also draws the shape of nihonium's outer orbitals, computed for a one-electron atom and shown without a scale.
Category
Post-transition metal
Period
7
Group
13
Block
p
Atomic mass
286.182 Da (longest-lived isotope, estimated)
Electron configuration
[Rn] 5f14 6d10 7s2 7p1 (predicted)
Phase at 25 °C
solid (predicted)

Properties

Properties of nihonium Standard atomic weights from IUPAC/CIAAW (abridged, 2024); other values from PubChem's periodic table, kelvin converted to °C.
Property Value Unit Source
Atomic number 113
Atomic mass 286.182   Da Da PubChem, longest-lived isotope, estimated
Electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p1 (predicted)
Phase at 25 °C solid (predicted)

This element has no standard atomic weight; the atomic mass shown is that of its longest-lived isotope, as PubChem gives it.

That mass is an estimate by the IAEA's Atomic Mass Data Center, not a measurement.

The electron configuration and the phase of this element are predictions, not measurements.