Information on mass chains and nuclides available on this website:

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¹⁷Na has not been observed: its mass excess is predicted to be 35.61 MeV by (66KE16). It is then unbound with respect to breakup into ¹⁶Ne + p by 4.3 MeV and with respect to breakup into ¹⁴O + 3p by 5.7 MeV. See also (83ANZQ, 85AN28, 88WA18, 92AV1B).