Describe the theory associated with the radius of an atom as it. Compare the size of (i)Cl atom with Cl- ion (ii) Na atom with Na+ ion.
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When an atom gains an electron, it forms anion. The atomic radius is smaller than the radius of the anion. This is because the number of electrons has increased but the nuclear charge remains the same. Hence, the electrons are less tightly held by the nucleus due to which the size increases.
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