What is the oxidation number of Ca in CaO?

+2 is the oxidation number of Ca in CaO


  • Calcium has 20 electrons, and its electronic configuration can be written as 2,8,8,2.
  • Thus, Calcium has 2 electrons in its outermost orbit, or it can be said that Calcium has 2 valence electrons.
  • Ca wants to give away these two valence electrons to its neighbouring Oxygen atom in CaO.
  • Calcium completes its octet by giving away the two valence electrons and attains the nearest inert gas argon’s electronic configuration.
  • Thus, Calcium now has 18 electrons, and hence its oxidation number becomes +2.

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