How electronegativity varies down the group and across a period. which is more electronegative : -35 or - 75 ?
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E.N decreases down the group due reduction in effective nuclear charge,increased shielding effect and increased size of atom.Along the period E.N increases due to increase in effective nuclear charge, decreased size of atom.
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So, as you move down a group on the periodic table, the electronegativity of an element decreases because the increased number of energy levels puts the outer electrons very far away from the pull of the nucleus. Electronegativity increases as you move from left to right across a period on the periodic table.
Explanation:
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