why atomic size decreases from left to right
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Explanation:
Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level. These electrons are gradually pulled closer to the nucleus because of its increased positive charge. Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.....
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In a period from left to right the number of valence electrons in the same shell increases due to which the effective nuclear charge increases and therefore atomic size decreases as we move from left to right in a period.
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