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Energy required for the electron excitat...

Energy required for the electron excitation in `Li^(++)` from the first to the third Bohr orbit is :

A

36.3 eV

B

108.8 eV

C

122.4 eV

D

12.1 eV

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(n)=-13.6(Z^(2))/(n^(2)) `
`E_(L^(++))=-13.6xx(9)/(1)=-122.4eV`
`E_(L^(++))=-13.6(9)/(9)=-136eV`
`Delta=-13.6-(-122.4)`
`=108.8eV`
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