The radii of the first Bohr orbit of H `(r_H), He^+ (r_(He^+))` and `Li^(2+) (r_(Li)^(2+))` are in the order

Options

A. `r_(He)^(+)gtr_(H)gtr_(Li)^(2+)`
B. `r_(H)ltr_(He)^(+)ltr_(Li)^(2+)`
C. `r_(H)gtr_(He)^(+)gtr_(Li)^(2+)`
D. `r_(He)^(+)ltr_(H)ltr_(Li)^(2+)`

Answer

C

Explanation

`r=0.529xxn^(2)/Z`
`rprop1/Z`
`therefore` order is `r_(H)gtr_(He)^(+)gtr_(Li)^(2+)`.