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Question

Choose the s− block element in the following :

A
1s2, 2s2, 2p6, 3s2, 3p6, 3d5, 4s1
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B
1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s1
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C
1s2, 2s2, 2p6, 3s2, 3p6, 4s1
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D
All of the above
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Solution

The correct option is C 1s2, 2s2, 2p6, 3s2, 3p6, 4s1
The correct option is c
Last electron enters the s subshell, but in case of options a and b , the last electron enters in d subshell and the elements are chromium and copper respectively.

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