For `Na^(+),Mg^(2+),F^(-) and O^(2-)`, the correct order of increasing ionic radii is :

Options

A. `Mg^(2+) lt Na^(+) lt F^(-) lt O^(2-)`
B. `O^(2-) lt F^(-) lt Na^(+) lg Mg^(2+)`
C. `Na^(+) lt Mg^(2+) lt F^(-) lt O^(2-)`
D. `Mg^(2+) lt O^(2-) lt Na^(+) lt F^(-)`

Answer

A

Explanation

All th speices have 10 elements each and hence are isoelectronic ions . Among isoelectronic ions , ionic size increases as the + Ve charge decrease or the - ve charge increases i.e., option ( a) is correct .