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Question

Which of the following pair of atomic numbers represents s-block elements?

A
7,15
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B
6,12
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C
9,17
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D
3,12
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Solution

The correct option is D 3,12
The general outer electronic configuration of s block elements are ns12.
Consider the options available:-
A) 7[He]2s22p3,15[Ne]3s23p3.
B) 6[He]2s22p2,12[Ne]3s2.
C) 9[He]2s22p5,17[Ne]3s23p5.
D) 3[He]2s1,12[Ne]3s2.
Hence, from the options we see that D is the right answer.

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