Which pair of elements has same chemical properties?

13, 22

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3, 11

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4, 24

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2, 4

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Solution

The correct option is B 3, 11
The pair which belongs to some group i.e., in which both the elements have same outer electronic configuration has same chemical properties.
$∴ 3 \Rightarrow 1 s^{2}, 2 s^{1}$
$11 \Rightarrow 1 s^{2}, 2 s^{1} 2 p^{2}, 3 s^{1}$

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