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I see 2 equations describing allowed energies for electrons in hydrogenic atoms, being:

[tex]E = -\frac{hcRZ^2}{n^2}[/tex]

And

[tex]E = -\frac{RZ^2}{n^2}[/tex]

I assume that both are correct, but what makes the difference? Is it the same R for both of them? or the second R includes the h and c inside?

How would I tell the difference?

Please enlighten me. Thanks :)