With the addition of four new elements, the seventh row of the periodic table is officially full, the International Union of Pure & Applied Chemistry (IUPAC) announced on Dec. 30.

These elements, with atomic numbers of 113, 115, 117, and 118 comprise the missing parts of period 7 – the lowest row – of the periodic table.

The International Union of Pure and Applied Chemistry (IUPAC), the official body in charge of chemistry’s ingredient list, added these elements to slots 113, 115, 117 and 118 on Dec. 30 ...