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give reason:

lithium atom is smaller than sodium atom

cl (atomic no 17)is more electronegative than sulphur (at no 16)

as we go down the group one shell is added regularly.thus lithium is smaller.

the non mettalic character increases acroos the period.thus cl is more electro negative

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The number of shells increases as we go down the periodic table. As the number of shells increases, the atomic radius of the elements also increases . 
Therefore lithium is smaller than sodium. 
The property of electro negativity increases as we go across the periodic table. Hence Cl is more electronegative .
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