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In regards to the number of electrons, the reason there can only be 2 electrons in the subshells of the example is because they specify a ml value. For example if all it said was n=3, then that would describe a possible 28 electrons (because of all the s,p,d orbitals and the electrons they hold). If it specified n=3 and l=1, it would describe a possible number of 6 electrons (because now we are only looking at the p-orbital in the 3rd shell). If it specified n=3 and l=1 and ml=1, then there can be at most 2 electrons with those 'coordinates', because we are only looking at the 3rd shell p-orbital y-axis (where one electron has positive spin and one has negative spin). This is the Pauli Exclusion principle. Hope this helps answer the first part of the question.
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