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The radius of the first orbit of H-atom ...

The radius of the first orbit of H-atom is r. then the radius of the first orbit of `Li^(2+)` will be:

A

r/9

B

r/3

C

3r

D

9r

Text Solution

Verified by Experts

The correct Answer is:
B
Formula for radius of H-like species,
`r_(n)=0.529xxn^(2)/ZÅ`
As `0.529xxn^(2)` is radius for H atom which is equal to r (given)
So, `r_(n)=r/3(n=1,Z=3,"for "Li^(2+))`.
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