Compare the radii of two species x and y. Give reason for your answer. x has 12 protons 12 electrons, y has 12 protons 10 electrons
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Solution
As both X and Y had 12 protons both has atomic number 12 that is magnesium.
In case of Y, we have only 10 electrons because of this the affect of nuclear charge on the electrons is more than that of on 12 electrons(happens for same number of protons).