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State the trends in the variation of electronegativity in group and periods. |
Answer» Solution :Variation of electronegativity in a period: The Variation of Electronegativity along I period electronegativity increases across a period from left to RIGHT. Since the ATOMIC radius DECREASES in a period, the ATTRACTION between the valence electron and the nucleus increases. HENCE the tendency to attract shared pair of electrons increases. Therefore, electronegativity increases in a period. Variation of electronegativity in a group: The electronegativity decreases down a group. As we move down a group, the atomic radius increases and the nuclear attractive force on the valence electron decreases. Hence electronegativity decreases in a group. 
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