1.

Which of the following element(s) belongs to halogen group ?

Answer»

`1s^2 , 2s^2 , 2p^6 , 3s^23p^5`
`1s^2 , 2s^2 , 2p^6 , 3s^2 3p^6, 4s^2`
`[AR]3d^10 , 4s^2 4p^5`
`[KR] 4d^10 , 5s^2 , 5p^5`

ANSWER :A::C::D


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