Nihonium

Chemical element with atomic number 113 (Nh)

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 element in the p-block.

From Wikipedia, under CC BY-SA. More on occurri.