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( a ) As we look at the atomic model it is clear that :
X has 2,8,1 electrons that is total = 11 , that means it is sodium .
Y has 2,1 electron distribution that is total of 3 electrons , this shows that it is Lithium .
( b ) Yes , they belong to same group as they have same valence electron that is 1.
They belong to group 1 .
( c ) In it sodium is more electropositive as it has big size , less nuclear charge and low ionisation energy .
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