Symbol Cr
Atomic Number 24
Atomic Mass 51.996 g.mol -1
Discovered by Vaughlin in 1797

Chemical Properties Of Chromium

Group 6 Melting point 1907 °C
Period 4 Boiling point 2672 °C
Block d Density (g cm−3) 7.19 at 20°C
Atomic number 24 Relative atomic mass 51.996
State at 20°C Solid Key isotopes 52Cr
Electron configuration [Ar]3d5 4s1 CAS number 7440-47-3
ChemSpider ID 22407 ChemSpider is a free chemical structure database

What is Chromium?

  • Chromium is a chemical element with atomic number 24 and represented by the symbol Cr in the Periodic Table.
  • Chromium is a lustrous, hard metal which has a silver-grey color. It has a high melting point.
  • Trivalent chromium is a vital nutrient that is found in traces sugar, human insulin, and lipid metabolism.

Uses Of Chromium

  • Electroplating: It is one of the important uses of chromium. Have you seen the shiny caps over the tires of a car? That shiny plating is made using chromium.
  • Emeralds: A small amount of chromium is found in the crystal lattice structure of expensive gems like the emerald.
  • New alloys: are formed using chromium. You might have seen chromium on the outside, but it is also mixed with metals to form alloys. Stainless steel and aluminum alloys use a small amount of chromium.
  • Paints and Dyes: This useful element is also found in paint and dyes and chemical makeup that is used for fabrics.

Properties Of Chromium

  • Chromium burns when heated and the compound that it forms is a green chromic oxide.
  • Chromium protects the metal below by immediately producing a thin oxide layer that is impermeable to oxygen.
  • One of the important characteristics of chromium is that it won’t get rusted easily, and thus this element is great for electroplating.

Certain Facts About Chromium

  • Chromium was used by ancient Chinese.
  • About eighty percent of chromium that is produced annually goes towards the production of metal alloy.

Practise This Question

Silk worms are fed on which of the following leaves to help them grow cocoons?