Nihonium
Chemical element
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Nihonium is a synthetic chemical element; it has 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... Wikipedia
Symbol: Nh
Atomic number: 113
Discoverer: Riken
Atomic mass: 286 u
Discovered: 2003
Valence electrons: three valence electrons
Chemical series: Metal, Boron group, and Period 7 element