1.

What is the energy of He electron in first orbit?

Answer»

`40.8eV`
`-27.2eV`
`-54.4eV`
`-13.6eV`

Solution :`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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