Abstract

The correct position of new elements in the periodic table is not a trivial matter. We understand the periodic table in terms of the filling of electron shells — a process that would seem to be entirely predictable. But relativistic effects can make the heaviest elements behave in unexpected ways. Now chemistry has been extended to element 106 (seaborgium). Experiments on just seven atoms, each lasting a few seconds, place seaborgium firmly in group six of the periodic table, under tungsten and molybdenum, raising the question of why it behaves in such a conventional way.

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