The orbit having Bohr radius equal to 1st Bohr orbit of H-atom is :
The orbit having Bohr radius equal to 1st Bohr orbit of H-atom is :
A. `n=2` of `He^(+)`
B. `n=2` of `B^(+4)`
C. `n=3` of `Li^(2+)`
D. `n=2` of `Be^(+3)`
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Correct Answer - D
`r_(n)=0.529 n^(2)/Z `
For hydrogen, `n=1` and `Z=1, :. r_(H)=0.529`
For `Be^(3+), n=2` and `Z=4, :. r_(Be^(3+))=(0.529xx2^(2))/(4)=0.529`
there, (D) is correct option.
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