# Energy levels in He+ ion and Hydrogen.

###### Question:

Suppose the first electron in the He+ ion (singly ionised, hydrogen-like ion) is in the ground (n=1) state, and a second electron is added in the n=10 level.
Explain why the energy of the second electron is almost identical to that of an electron in the same level in hydrogen atom and despite the second electron being in ahigh energy orbit why there is still an effect on the energy of the first electron. Is the energy increased or decreased? Explain your reasoning.

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