1.

What is the energy of He^(+) electron in first order?

Answer»

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

Solution :For hydrogen like ATOMS or IONS, `E_(N) = (-13.6Z^(2))/(n^(2)) eV`
For `He^(+),. Z = 2 and n = 1`
`E_(1) = (-13.6 xx 2^(2))/(12) = -54.4 eV`


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