I've read this question What would the periodic table of a 4-Dimensional universe look like?, and I think it answers part of my question about how atomic physics would work, but I'm not sure. Would a 2-dimensional atom have any rotational axis? How would that affect the spin? How many orbitals would be in each energy level? I'm assuming that protons, neutrons, and electrons exist.

I moved this over to Physics. https://physics.stackexchange.com/questions/449678/what-would-the-periodic-table-look-like-in-2-dimensions

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    $\begingroup$ are you sure that atoms can exist at all in a 2D space? $\endgroup$ – L.Dutch - Reinstate Monica Dec 21 '18 at 12:12
  • $\begingroup$ No, not really. $\endgroup$ – Pyrania Dec 21 '18 at 12:15
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    $\begingroup$ I'm assuming that protons, neutrons, and electrons exist Not as we would know them. The atom in 2D would literally be the Neils Bohr model on paper, not anything like what we know of atomic structure $\endgroup$ – nzaman Dec 21 '18 at 12:17
  • $\begingroup$ Here is a relevant article: aapt.scitation.org/doi/10.1119/1.14360 $\endgroup$ – pregunton Dec 21 '18 at 12:53
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    $\begingroup$ I voted to close this because this is a "Develop my high-concept" kind of question. Further more this is not even about worldbuilding but physicsbuilding. You may want to post this in the Worldbuilding or Physics SE chat and see what that gives. But as a question in the Q&A section, I am sorry but it simply does not fit. $\endgroup$ – MichaelK Dec 21 '18 at 13:21