Question

in the third Period of the periodic table the element having smallest size is
a) na
b) ar
c) cl
d) si

Answer 1

in a period from left to right atomic size decreases due to Increase in nuclear charge
but the noble gases are bigger than the halogens as they have octet and sort of repulsion occurs in the shells
so the smallest element in a period is the halogen
so chlorine cl is the smallest

Answer 2

Cl is the smallest element
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