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Swati Srivastava from ST. ANTHONY'S SCHOOL, 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 From Christ Nagar Senior Secondary School, 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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Remitha From The Indian Public School, added an answer, on 10/3/12
14 helpful votes in Science

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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