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The electronic configuration of few elem...

The electronic configuration of few elements is given below. Mark the statement which is not correct about these elements.
(i) `1s^(2)2s^(2)2p^(6)3s^(1)`
(ii) `1s^(2)2s^(2)2p^(5)`
(iii) `1s^(2)2s^(2)2p^(6)`
(iv) `1s^(2)2s^(2)2p^(3)`

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