1.

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

Answer»

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

Answer :A


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