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The electronic configuration of four ele...

The electronic configuration of four elements A, B, C and D are:

A

`1s^(1)`

B

`1s^(2) 2^(2) 2p^(1)`

C

`1s^(2) 2s^(2) 2p^(5)`

D

`1s^(2) 2s^(2) 2p^(6)`

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