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Chemistry


Chromium

Name: Chromium
Symbol: Cr
Number of Energy Levels: 4
Electrons on the outer energy level: 1
Atomic number: 24
Atomic Mass: 51.9961 Amu (Atomic Mass Units)
Protons/Electrons: 24
Neutrons: 28
Density: 7.19 g/cm3
Classification: Transition Metal

Chromium | Chemical elements

Chromium was discovered in 1797 by Louis Vauquelin. Chromium’s name derives from the Greek word chroma which means color. Chromium’s melting Point is at 1857.0 °C (2130.15 K, 3374.6 °F) and boiling point at 2672.0 °C (2945.15 K, 4841.6 °F).

Top 12 interesting facts about chromium

  1. Chromium is a steely-gray metal.
  2. Chromium is the only solid metal which is antiferromagnetic.
  3. Most of chromium compounds are very colored which explains its origin name.
  4. Most of the world’s chromium is extracted from iron chromium oxide (FeCr2O4).
  5. Chromium has a very high resistance and hardness.
  6. Steel is made highly resistant to corrosion and discoloration with the help of chromium.
  7. Electroplating with chromium is another important application in which chromium plays a major role.
  8. Every year approximately 3.3 tones of ferro-chrome are produced.
  9. The largest producers of chromium ore are South Africa, India, Kazakhstan, and Zimbabwe.
  10. In the air, chromium forms a very thin but dense layer of oxide (just few atoms thick) which prevents it from further oxidation.
  11. Chromium is the 22nd most abundant element in the Earth’s crust.
  12. Chromium has three stable isotopes 52-Cr (the most abundant), 53-Cr, and 54-Cr.

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