The chromium replaces about 1% of the aluminum in the corundum ... colors using an endless variety of complex structures made ...

Chrome yellow, also known as "school bus yellow", was adopted ... neptunium - element number 93 in the periodic table. In June 1940, American physicists Edwin McMillan and Philip Abelson, working at ...

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 ...

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 ...

Then in 1869, a Russian scientist called Dmitri Mendeleev produced one of the first practical periodic tables. He wrote the properties of the elements on pieces of card and rearranged them until ...