Question

the energy of an electron of He is​

Answer 1

The He+ ion is just like a hydrogen atom with two units of charge in the nucleus. Since the hydrogenic energy levels depend upon the square of the nuclear charge, the energy of the remaining helium electron should be just 4x(-13.6 eV) = -54.4 eV as observed.

Answer 2

Answer:

I think the answer is-54.4ev