Find the ratio of `Li^(++)` ions in its ground state assuming Bohr 's model to be vaild

Options

A. `53p m`
B. `27p m`
C. `18p m`
D. `13p m`

Answer

C

Explanation

On the basis of Bohr's model, `r=(n^(2)h^(2))/(4pi^(2)mKZe^(2))=a_(0) (n^(2))/Z`
for `Li^(+++)` ion, Z=3, n=1 for ground state
Given `a_(0)=53p m :. r =(53xx1^(2))/3=18p m`