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If A^(+) and B^(2+) ions are isoelectron...

If `A^(+) and B^(2+)` ions are isoelectronic, then which of the following informations regarding their size is correct:
(1) `A^(+) gt B^(2+)`
(2) `A^(+) gt B^(2+)`
(3) `A^(+)=B^(2+)`

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`A^(+) gt B^(2+)`
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