Identify the pair of elements representing the s - block elements.

7, 15

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9, 17

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2, 10

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11, 12

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Solution

The correct option is D 11, 12
$Z = 11$ , electronic configuration - $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
$Z = 12$ , electronic configuration - $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$
Both correspond to 's' block elements.

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