Which one of these configurations belongs to unstable configuration?

2, 8, 1

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2, 8, 8

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2, 8

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Solution

The correct option is C 2, 8, 1
2, 8, 1 does not belong to stable configurations as this configuration do not have fully filled electrons and can lose one electrons.

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Which one of these groups belongs to stable configuration?

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2, 8, 2

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