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^(Theta)`
D. `n = 3,Li^(2+)`

Answer

B

Explanation

`r = 0.529 xx (n^(2))/(Z) Å`
For Bohr's orbit of H ltBRgt `R_(h) = 0.529 XX (1^(2))/(1) = 0.529 Å`
`For n = 2, Be^(3+)`
`r_(H) = 0.529 xx (Z^(2))/(4) = 0.529 Å`