However, in the quark model, Deltas are different states of nucleons (the N⁺⁺ or N^- are forbidden by Pauli's exclusion principle). Isospin, although conveying an inaccurate picture of things, is still used to classify baryons, leading to unnatural and often confusing nomenclature.

Flavour quantum numbers

The strangeness flavour quantum number S (not to be confused

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