Which statement about the radii of atoms and their ions is correct?

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Cations are smaller than their atoms, anion are larger.

Cations and anions are both smaller than their atoms.

Cations and anions are both larger than their atoms.

Cations are larger than their atoms, anions ar smaller.

answer is A.

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Detailed Solution

Cations are smaller than their atoms, anion are larger Because the valence shell of a cation loses electrons, so the number of shells reduces, and an anion gains electrons, so the number of shells increases.

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