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Q.

Which of the following pair of elements are from the same group of the periodic table

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a

Na, Cl

b

Mg, Cs

c

Mg, Sr

d

Mg, Cl

answer is B.

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Detailed Solution

In the periodic table, the elements Ma and Sr belong to same group (IIA) with valency configuration ns2

Ex: Mg (Z= 12); Electronic configuration is Ne3s2

For Sr (Z =38); Electronic configuration is kr5s2

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Which of the following pair of elements are from the same group of the periodic table