Of all chromium's natural occurrences ... neptunium - element number 93 in the periodic table. In June 1940, American physicists Edwin McMillan and Philip Abelson, working at the Berkeley Radiation ...

Chromium is a metal in group VIB of the periodic table with atomic number 24, an atomic weight of 51.996, and a density of 7.19. It has a melting temperature of 1875 C. The electronic configuration ...

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

One feature of compounds made with transition metals is their intense colour. There are many examples in nature, including ...

Both rubies and emeralds are minerals, which is a type of rock with a consistent chemical composition and a highly ordered ...

The chromium replaces about 1% of the aluminum ... variety of complex structures made with the elements in the periodic table.