if the radius of H is `0.53 Å` then what will be the radius of `._(3)Li^(2+)` ?

Options

A. `0.17 Å`
B. `0.36 Å`
C. `0.53 Å`
D. `0.59 Å`

Answer

A

Explanation

The radius of hydrogen atom `= 0.53 Å. ""_(3)Li^(2+)` ion also has only one electron but it has 3 protons in nucleus, hence, its electron feels three times more attraction from nucleus in comparison of hydrogen atom. Thus, the radius of `""_(3)Li^(2+)` will be
`= (0.53)/3 = 0.17 Å`