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Q. Which pair of elements has same chemical properties?

UPSEEUPSEE 2014Classification of Elements and Periodicity in Properties

Solution:

The pair which belongs to some group i.e., in which both the elements have same outer electronic configuration has same chemical properties.

$\therefore 3 \Rightarrow 1 s^{2}, 2 s^{1}$

$11 \Rightarrow 1 s^{2}, 2 s^{1} 2 p^{2}, 3 s^{1}$