1.

Which one of the following configuration represents a noble gas ?

Answer»

`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4S^(2)`
`1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)`
`1s^(2)2s^(2)2p^(6)3p^(6)`
`1s^(2)2s^(2)2p^(6)3s^(2)`

Answer :B


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