Nihonium is a synthetic chemical element with the symbol Nh and atomic number 113. It is extremely radioactive; its most stable known isotope, nihonium-286, has a half-life of about 10 seconds. In the periodic table, nihonium is a transactinide element in the p-block. It is a member of period 7 and group 13.
Symbol: Nh
Atomic number: 113
Atomic mass: 286 u
Discovered: 2003
Naming: After Japan (Nihon in Japanese)
Period: period 7
Discoverer: Riken
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