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What is a periodic property? How the fol...

What is a periodic property? How the following properties vary in a group and in a period? Explain
(b) EN.

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The repetition of similar physical and chemical propertes of elements at regular intervals with increasing atomc number is called periodic property or periodicity.
(b) Electronegativity: As we go from left to right in a period, the electronegativity gradually increases.
Reason: In a period, as we go from left to right, atomic radius gradually decreases. As a result of which the tendency of attraction of nucleus on the bonded pair increases. Hence the values of electronegatvity increases in a period.
Reason: As we go from top to bottom in a group, the atomic radius gradually increases. As a result of which the tendency of attraction of nucleus on the bonded pair decreases. Hence, the value of electronegativity decreases in a group.
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