Calculate the radius of Bohr's 3rd orbit in `Li^(+2)` ion

Explanation

we know that, `r_(n) = (n^2)/(Z) xx 0.529 A^(0)`
when n=3 and Z = 3,
`r_(3) = (3^2)/(3) xx 0.529 A^(0) = 3xx 0.529A^(0)=1.587 A^(0)`