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The ions O^(-2),F^(-),Mg^(2+) and Al^(3+...

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

A

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

B

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

C

a significant increases form `O^(2-)` to `Al^(3+)`

D

a significant decrease form `O^(2-)` to `Al^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
D
On increasing atomic number of isoelectronic , species ionic radii decreases due to increasing effective nuclear charge `(Z_("eff"))`
`"Radius"prop(1)/("Atomic number")prop (1)/(Z_("eff"))`
So, as the negative charge increases ionic radii increases while on increasing positive charge ionic radu decreases. Anions having higher ionic radil than the cation
`O^(2+) gt F^(-) gt Na^(+) gt Mg^(2+) gt Al^(3+)`
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