Which one in each of the following ...

Which one in each of the following pairs is larger in size ?
(a) `Na,Al " " (b ) Na,Mg^(+2)" "(C ) S^(2- ) , Cl^(-) " " (d ) Fe^(2+), Fe ^(3+)" " (e ) C^(4- ) , F^(-)`

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(a ) Na has larger size
(b ) Na has larger size
(c ) `S^(2-)` has larger size
(d ) `Fe^(2+)` has larger size
(e ) `C^(4-)` has larger size

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