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The radius of which of the following orb...

The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom.

A

`He^(+)(n=2)`

B

`Li^(2+) (n=2)`

C

`Li^(2+) (n=3)`

D

`Be^(2+) (n=2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`r_H = 0.529 n^2/z Å`
For hydrogen, n = 1 and z =1 therefore
`r_H= 0.529Å`
For `Be^(3+):Z=4 and n=2` Therefore
`r_(Be^(3+)) =(0.529xx2^2)/(4) = 0.529Å`
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