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Per NCERT §3.7.1(b), among the ISOELECTRONIC species O²⁻, F⁻, Na⁺, Mg²⁺ (each with 10 e⁻), which has the LARGEST radius?
AMg²⁺
BO²⁻ — lowest nuclear charge (Z=8) ⇒ weakest pull, largest size
CNa⁺
DF⁻
Answer & Solution
Correct answer: B. O²⁻ — lowest nuclear charge (Z=8) ⇒ weakest pull, largest size
Per NCERT §3.7.1(b), within an isoelectronic series, lowest Z gives largest size. Z: O=8 < F=9 < Na=11 < Mg=12, so O²⁻ is largest.
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