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## Homework Statement

Hi, for while i've been under the impression that spectral lines of all the elements can be calculated. I did some research and found that there is a simple equation (Rydberg Equation) to determine the spectral lines of Hydrogen.

However, I found a source that stated there is no simple equation to determine the spectral lines of the other elements.

So my questions are:

- How are spectral lines predicted for elements other than hydrogen?
- How is the energy difference for an electron in its excited state and its ground state calculated?