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

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 colourful history of chromium begins, suitably enough, at the far end of the visible spectrum with a red-orange mineral that was named "Siberian red lead" by its discoverer, the 18th-century ...

In fact, the name chromium comes from the Greek word for color. Chromium's symbol on the periodic table of elements is Cr. Not found on its own as a free metal, chromium exists in nature in a ...

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

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

Instead they proposed bohrium, which became the officially recognised name in 1997. In the periodic table bohrium lies below chromium, technetium and rhenium in group 6. However, the application of ...

Chromium Transition elements 1890°C 7.19 g/cm 3 Manganese Transition elements 1240°C 7.20 g/cm 3 Iron Transition elements 1538°C 7.87 g/cm 3 Cobalt Transition elements 1492°C 8.90 g/cm 3 ...