Why atomic size decreases on moving from left to right along a period in periodic table
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Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. ... The valence electrons are held closer towards the nucleus of the atom. As a result, the atomic radius decreases.
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Explanation:
Since atomic no. increases, and no. of protons increases on moving from left to right in the periodic table hence due to more attractive force size decreases
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