ionic radius of anion is larger than the atomic radius . why?
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One such trend is closely linked to atomic radii -- ionic radii. Neutral atoms tend to increase in size down a group and decrease across a period. When a neutral atom gains or loses an electron, creating an anion or cation, the atom's radius increases or decreases, respectively.
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this is because this creates a larger positive charge in the nucleus than the negative charge in the electron charge,causing the electron cloud to be drawn a little closer to the nucleus as an ion
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