1.

`Na^(+), Mg^(2+), Al^(3+)`, and `Si^(4+)` are isoelectronic ions. Their ionic size will follow the orderA. `Na^(+) gt Mg^(2+) gt Al^(3+) lt Si^(+4)`B. `Na^(+) gt Mg^(2+) lt Al^(3+) gt Si^(+4)`C. `Na^(+) gt Mg^(2+) gt Al^(3+) Gt Si^(+4)`D. `Na^(+) gt Mg^(2+) gt Al^(3+) lt Si^(+4)`

Answer» Correct Answer - C
In isoelectronic cations, the size decreases with increases in nucler charge
`Na^(+) gt Mg^(2+) gt Al^(3+) gt Si^(4+)`


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