Why the electronegativity increases across the period?
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It is no wonder the electron pair gets dragged so far towards the chlorine that ions are formed. Electronegativity increases across a period because the number of charges on the nucleus increases. That attracts the bonding pair of electrons more strongly.
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bcoz, as we move along the period the nuclear charge density increase , so the electrons are strongly bounded. ,so it is difficult to take a electron from it.
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