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Q 3113701649.     A, B, C, D and E have the following electronic
configuration:
`A : 1s^2 2s^2 2p^1`
`B : 1s^2 2s^2 2p^6 3s^2 3p^1`
`C : 1s^2 2s^2 2p^6 3s^2 3p^3`
`D : 1s^2 2s^2 2p^6 3s^2 3p^5`
`E : 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2`.
Which among these belong to the same group
in the periodic table?

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