Explain the factors affecting electronegativity. write its periodicity in periods and groups . what is amemalousbehaviour of period—2 elements in each group? Explain.
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Answer:
Periodicity in periods and groups of electronegativity.
Electro-negativity increases from left to right in a period in the periodic table since nuclear charge increases and atomic radius decreases which cause electro-negativity to increase across a period. With some exceptions (especially within transition metals), electro-negativity decreases in going down a group due to successive appearance of inner shells and increase in atomic radius with increase in atomic number. The addition of extra inner shells in larger atoms screen the shared pair from the nucleus and thus the electron pair is attracted less by the atoms in the combined state. The values are unit less.
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