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In 1913 Henry Moseley established a method for counting the elements. It became clear that there were seven elements missing from the periodic table. In this book, Eric Scerri presents the discovery of those seven elements, five of which are radioactive and three or possibly four of were first isolated by women.

Periodic table of the elements. --- Periodic law --- Chemical elements --- 544.116 --- Elements, Chemical --- concepten van chemische elementen --- Periodic law - Tables --- Chemical elements.