Answer:
The size of a cation is always smaller than the parent atom
because the loss of one or more electrons increases the effective nuclear
charge. This increases force of .attraction towards nucleus and thus,
contraction in size occurs. The size of an anion is always larger than the parent
atom because the acceptance of one or more electrons decreases the effective
nuclear charge. This decreases force of attraction towards nucleus and thus, expansion
in size increases.
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