Consider the isoelectronic species, `Na^(+),Mg^(2+),F^(-)` and `O^(2-)`. The correct order of increasing length of their radii is:

Options

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

Answer

B

Explanation

In case of isoelectronic species, ionic radii
`prop 1/("atomic number")`
The ionic radii increases as the positive charge decreases or the negative charge increases.