Question

Valency of oxygen is -2. Give reason.

Answer 1

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• As we all know that complete valance shells are stable
• All atoms strive for being stable
• The number of electrons in valance shell in an oxygen atom is 6
• So, for Oxygen to be stable it can give 6 electrons or it can take in 2 electrons, for being stable
• As the energy required for taking in 2 electrons is lesser than the energy required for giving out 6 electrons.
• Oxygen atom takes in 2 electrons and gets in stable state
• Hence the valancy of Oxygen is -2

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