Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B. `1s^(2)2s^(2)2p^(1)`C. `[He]2s^(2)2p^(6)3s^(1)`D. None of these

Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B

1.	Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B. `1s^(2)2s^(2)2p^(1)`C. `[He]2s^(2)2p^(6)3s^(1)`D. None of these
Answer» Correct Answer - B The block of an element depends on the type of sub- shell which receives the last electron. As last electron enters in p- subshell of outmost shell according to Aufbau rule, the element of optin `(b)` belongs to p-block.

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Which is not a `s-` block element ?A. `[Ar]4s^(2)3d^(10)4p^(6)5s^(1)`B. `1s^(2)2s^(2)2p^(1)`C. `[He]2s^(2)2p^(6)3s^(1)`D. None of these

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