Which of the following orders of ionic radii is correctly represented ?

Options

A. `H^(- ) gt H^(+) gt H`
B. `Na^(+) gt F^(-) gt O^(2-)`
C. `F^(-) gt O^(2-) gt Na^(+)`
D. `Al^(3+) gt Mg^(2+) gt N^(3-)`

Explanation

None of the option is correct: An atom loses electron (s) to form a cation. Thus, radius of the formed cation is less than the parent atom. Again ann atom gains electron (s) to form an anion. So, radius of the formed anion is greater than the parent atom. therefore, `H^(-) gt H gt H^(+)`.
Now, for isoelectronic species, with increase in theiir atomic number, their ionic radii decrease. Therefore, the correct order of ionic radii are `O^(2-) gt F^(-) gt Na^(+) and N^(3-) gt Mg^(2+) gt Al^(3+)`.