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

Which of the following is true regarding an emulsion?