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The ions O^(2-), F^(-), Na^(+), Mg^(2+),...

The ions `O^(2-), F^(-), Na^(+), Mg^(2+)`, and `A1^(3+)` are isolectronic. Their ionic radii show

A

a decrease from `O^(2-)` to `F^(-)`and then increase from `Na^(+)` to `A1^(3+)`

B

a significant increase from `O^(2-)` to `A1^(3+)`

C

a singnificant decrease form `O^(2-)`to `A1^(3+)`

D

an increase from `O^(2-)` to `F^(-)` and then decrease from `Na^(+)` to `A1^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
C
They are all isoelectronic species. For such species,
Atomic radius `prop (1)/("Nuclear charge")`
`O^(2-)` has the minimum atomic number `(Z = 8)` while `A1^(3+)` has the maximum atomic number. Thus, there is a significant decreases is size from `O^(2-)` to `A1^(3+)`.
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