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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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Electronegativity: Electronegativity increases from left to right in a period since the atomic radii decreases and nuclear attraction increases. In a group electronegativity decreases from top to bottom due to an increase in atomic radii and a decrease in nuclear attraction.
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