The one with the largest ionic size isA. `O^(2-)`B. `Mg^(2+)`C. `F^(-)

1.	The one with the largest ionic size isA. `O^(2-)`B. `Mg^(2+)`C. `F^(-)`D. `Na^(+)`
Answer» `O^(2-), F^(-)Mg^(2+)` and `Na^(+)` are isoelectronic species (each having `10 e^(-)`). The size of isoelectronic species decreases with increase in nuclear charge (number of protons). Hence, correct order of size is `O^(2-)gt, F^(-)gt Na^(+)gt Mg^(2+)`

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