For the last fifty or so years, the periodic table has been incomplete. Elements after uranium on the periodic table have been synthesized for the past few decades, but there were always a few missing ...
For now, they're known by working names, like ununseptium and ununtrium — two of the four new chemical elements whose discovery has been officially verified. The elements with atomic numbers 113, 115, ...
Click on the picture above for an interactive guide to the periodic table. Photo: Corbis If someday we communicate with another part of the universe, we can be sure of one thing that both cultures ...
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