Sentence: Parity with the number is used to label nuclear angular momentum states, examples for some isotopes of hydrogen H, carbon C, and sodium Na are The reason for the unusual fluctuations in , even by differences of just one nucleon, are due to the odd and even numbers of protons and neutrons pairs of nucleons have a total angular momentum of zero just like electrons in orbitals, leaving an odd or even number of unpaired nucleons.
Combination: electrons in orbitals (root: electron, modifier: orbital)
Property: pair
Property type: emergent