The electronic configuration of a s-block element is ${[Ne]3s}^{2}$ . The group number of this element is:
2

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Solution

The correct option is A 2
The elements in which the last electron enters in the s-subshell are called s-block elements. These elements are present in group 1 and 2 of the modern periodic table.

For s-block elements, the group number is equal to the number of electrons in the outermost s-subshell. Since, ${[Ne]3s}^{2}$ has two electrons in its outermost s-subshell (3s), its group number is 2.

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