118 Officially Recognized Elements in the Table

The International Union of Pure and Applied Chemistry (IUPAC) recognizes 118 chemical elements, from hydrogen to oganesson. IUPAC confirmed the discoveries of the four heaviest elements—numbers 113, 115, 117, and 118—in 2015; their official names, nihonium, moscovium, tennessine, and oganesson, were approved in 2016. All were synthesized in laboratories and are radioactive.