Swati Srivastava , asked a question
Subject: Science , asked on 1/3/15

give reason:

lithium atom is smaller than sodium atom

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

Pranesh.s , added an answer, on 1/3/15
15 helpful votes in Science
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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