The colors of rubies and emeralds are so striking that they define shades of red and green—ruby red and emerald green. But ...

The official governing body, the International Union of Pure ... group and helium should be moved to the head of the alkaline earth metals. Clearly the periodic table, and the elements, still hold ...

But Iupac, the official body that governs the naming of elements ... Instead they proposed bohrium, which became the officially recognised name in 1997. In the periodic table bohrium lies below ...