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The energy required for electron to tran...

The energy required for electron to transist from n = 1 to n = 3 in `Li^(+2)` is ......

A

12.1 eV

B

36.3 eV

C

108.8 eV

D

122.4 eV

Text Solution

Verified by Experts

The correct Answer is:
C
`E_(n)=(13.6Z^(2))/(n)eV`
For `Li^(++),Z=3`,
`E_(1)=(13.6(3)^2)/((1)^(2))=-122.4eV`
`E_(3)=-(13.6xx(3)^(2))/((3)^(2))=-13.6eV`
`:.DeltaE=E_(3)-E_(1)=-13.6+122.4=108.8eV`
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