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Electronic Configuration

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Question

Find out the valency of the atoms represented by the Fig(a) and (b).

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Solution

Atom (a) has zero valency since it has 8 electrons in the valence shell and has achieved a stable configuration.
Atom (b) has a valency of 1 since it has 7 electrons in the valence shell. Atom (b) can accept one more electron in order to achieve a stable (octet) configuration.

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Electronic Configuration

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