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Question

Which one of the following does not belongs to group 14?
1. [He]2s1 2. [He]3s2 3. [He]2s22p2 4. [Ne]3s23p1

A
1,2,4
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B
2,3,4
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C
1,3,4
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D
only 2, 4
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Solution

The correct option is A 1,2,4
1. [He]2s1 is electronic configuration of Li which belong to group 1.
2. [He]3s2 is electronic configuration of Be which belong to group 2.
3. [He]2s22p2 is electronic configuration of C which belong to group 14.
4. [Ne]3s23p1 is electronic configuration of Al which belong to group 13.
Hence correct option is a.

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