Total number of valency (or bonding) electrons required to form a molecule, where n = no. of atoms in a molecule:

2 n - 2

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n - 2

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n + 2

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2 n

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Solution

The correct option is D $2 n - 2$
Total number of valency (or bonding) electrons required to form a molecule, (where n = no. of atoms in a molecule) is $2 n - 2$ .

For example, hydrogen contains 2 atoms and requires two bonding electrons for the formation of the molecule. $2 n - 2 = 2 (2) - 2 = 2$ .

Also for water which contains 3 atoms and requires 4 bonding electrons for the formation of the molecule. $2 n - 2 = 2 (3) - 2 = 4$ . This generalization does not hold good for molecules contains double or triple bonds.

Option A is the answer.

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