The seventh row of the periodic table is now complete.
Four as-yet-unnamed chemical elements — labeled 113, 115, 117, and 118 — mark the first additions to the table since 2011. The elements, which are all classified as "superheavy" because they have more than 104 protons, were officially acknowledged by the U.S.-based International Union of Pure and Applied Chemistry on Dec. 30.
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Next up, scientists say: discovering element 119.