 Another nucleus with 3 nucleons, the triton hydrogen-3 is unstable and will decay into helium-3 when isolated.Weak nuclear stability with 2 nucleons {NP} in the 1s orbital is found in the deuteron hydrogen-2, with only one nucleon in each of the proton and neutron potential wells.While each nucleon is a fermion, the {NP} deuteron is a boson and thus does not follow Pauli Exclusion for close packing within shells.