The radus of hydrogen atom in the ground state `0.53 Å`. The radius of `Li^(2+)` ion (Atomic number = 3) in a similar state is

Options

A. 1.27 Å
B. 0.17 Å
C. 0.57 Å
D. 0.99 Å

Answer

B

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=0.17Å`.