Reason why are cations smaller than neutrals atom?
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A cation is smaller than the neutral atom as the effective nuclear force on each electron increases due to a decrease in the number of electrons. Thus the electrons are held a bit more closely towards the center. This decreases the atomic radius making it ‘smaller’.
In the case of an anion, the number of electrons increases thus reducing the effective nuclear force exerted by protons. Each electron experiences a decreased force. This expands the atomic radius a bit making it bigger!
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