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What is the energy of He electron in fir...

What is the energy of He electron in first orbit?

A

`40.8eV`

B

`-27.2eV`

C

`-54.4eV`

D

`-13.6eV`

Text Solution

Verified by Experts

The correct Answer is:
C
`He^(+), Li^(++)` are like hydrogen
`E_(n)=(-Z^(2)13.6)/(n^(2))`, Here `He^(+),Z=2`
`:.E_(1)=(-(2)^(2)13.6)/((1)^(2))eV=-54.eV`
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