Nihonium (Nh)

Isotopes of Nihonium 

Isotope Atomic Mass Half-life Mode of Decay
Nh-283 283 0.147 seconds α to Rg-279
Nh-284 284 0.376-1.196 seconds α to Rg-280


Nihonium is the name of a chemical element with the atomic number 113. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, Nihonium-286, has a half-life of 20 seconds. Nihon is one of the two ways to say “Japan” in Japanese, and its literal meaning is “the Land of Rising Sun.” The name was proposed to make a direct connection to the nation where the element was discovered - nihonium is the first element to have been discovered in an Asian country. Nihonium is produced via the α-decay of element 115 (now called moscovium), and it was first created in 2003 by the Joint Institute for Nuclear Research in Dubna, Russian Federation.


Properties of Nihonium

Name Nihonium
Symbol Nh
Atomic number 113
Atomic weight [284]
Standard state Presumably a solid at 298 °K
CAS Registry ID 54084-70-7
Group in periodic table 13
Group name None
Period in periodic table 7
Block in periodic table p-block
Color Unknown, but probably metallic and silvery white or grey in appearance
Classification Metallic
Melting point 430 °C (predicted)
Boiling point 1130 °C (predicted)
Density of solid 16.00 g/cm3 (predicted)
Electron configuration [Rn]5f146d107s27p1
Heat of vaporization 130 (predicted) kJ·mol-1
Heat of fusion

7.61 (extrapolated) kJ·mol-1

Oxidation states

+1, +2, +3, +5 (predicted)

Isotope Supplier: ISOFLEX logo