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Question

The electronic configuration of a p-block element is [He]2s22p5. The group number of this element is:
  1. 17

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Solution

The correct option is A 17
Elements in which the last electron enters the outermost p-subshell are called p-block elements. They are present in the groups 13 to 18 of the modern periodic table.

For p-block elements, the group number can be obtained by adding 12 to the total number of electrons present in the outermost p-subshell. Since, [He]2s22p5 has five electrons in its outermost p-subshell (2p), its group number is 17 (12+5).

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