Chromium

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Chromium
51.9961(6)



  Cr
24
1s22s22p63s23p63d54s1
[ ? ] Transition metal:
Properties:
Steel-gray, lustrous, hard metal. Malleable and corrosion resistant. Multi-valent.
Hazard:
Hexavalent chromium is toxic.


Chromium is a chemical element, having the chemical symbol Cr. Its atomic number (the number of protons) is 24. It has a standard atomic weight of 51.9961 g•mol −1 and is a solid in its elemental form.

Chromium is considered to be a member of the "Transition metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 2,671 °C, and a melting point of 1,907 °C.