Information on mass chains and nuclides available on this website:

WWW TUNL

The mass excess of ²⁰B is predicted to be 69.08 MeV (74TH01). ²⁰B is then unstable with respect to breakup into ¹⁹B + n by 0.9 MeV: see ¹⁹B in (95TI07) and (78AJ03, 83ANZQ) and see the work on effective interactions for the (0p1s0d) nuclear shell-model space (92WA22).