Nihonium (Nh), moscovium (Mc), tennessine (Ts), and oganesson (Og): Welcome to the periodic table.

The International Union of Pure and Applied Chemistry (IUPAC) approved the names and symbols for four new elements earlier this week. After verifying their discovery last December, the IUPAC suggested names for these four elements in June, pending a five-month review period for public comment.

Nh, Mc, Ts, and Og – officially designated as elements 113, 115, 117, and 118, respectively – will complete the seventh period (or row) on the table, making them some of the heaviest metals on the table. These elements are synthetic, or man-made, and they only exist for fractions of a second in a lab before breaking apart into other elements.

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