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It's me

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## Homework Statement

If a system comprised only of two electrons was physically possible (such as positronium but with two electrons), what would its energy levels be and how would they relate to the energy levels of Helium?

## Homework Equations

##E_{Helium} = E_{n1}+E_{n2}=-\frac{\mu Z^2 e^4}{2\hbar^2}\frac{1}{n_1^2}-\frac{\mu Z^2 e^4}{2\hbar^2}\frac{1}{n_2^2}## with ##Z=2##

##E_{Positronium} = E_{n}=-\frac{\mu Z^2 e^4}{2\hbar^2}\frac{1}{n^2}## with ##Z=1##

## The Attempt at a Solution

I'm really not sure how to approach this question since it's not a physically possible system. Is it similar to helium (because the particles are identical) or to positronium (because there is no nucleus)? Is ##Z=1## or ##Z=2##? I'm just confused.