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The periodic table is one of the founding stones of chemistry and now four new elements have been formally added to it. The elements - 113, 115, 117 and 118 - complete the table's seventh row. Dr Linda Soby is Executive Director of the International Union of Pure and Applied Chemistry, the body which governs chemical science and verified the discovery. (Photo: Kosuke Morita led the Japanese team at the Riken Institute who discovered element 113. Credit: AP)