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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)

Remitha , From The Indian Public School , added an answer
Answered on 10/3/12

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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Pranesh.s , From Christ Nagar Senior Secondary School , added an answer
Answered on 1/3/15
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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