Which hydrogen -like species will have the same r adius as that of Bohr orbit of hydrogen atom ?

Options

A. `n=2,Li^(2+)`
B. `n=2,Be^(3+)`
C. `n=2,He^(+)`
D. `n=3,Li^(2+)`

Answer

B

Explanation

`r=(n^(2)h^(2))/(4pi^(2)mze^(2))`