1.

Which orbit of Be^(3+) has almost same radius as that of the ground state ofH-atom?

Answer»

Second
Third
Fourth
Sixth

Solution :`r_(n)=(0.059n^(2))/Z`
`r_(1)=(0.059xx1^(2)=0.059`
`r_(n)(Be^(3+))=(0.059xxn^(2))/4=0.059 "" ( :. Z=4)`
` n^(2)=4 `or `n=2`


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