Information on mass chains and nuclides available on this website:

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¹⁸Be has not been observed. It is predicted to have a mass excess of 78.43 MeV: see (78AJ03). ¹⁸Be is then unstable with respect to breakup into ¹⁶Be + 2n, ¹⁵Be + 3n, ¹⁴Be + 4n, ¹³Be + 5n, ¹²Be + 6n, ¹¹Be + 7n and ¹⁰Be + 8n by, respectively 3.01, 3.04, 6.26, 2.92, 4.93, 1.76 and 1.26 MeV, using the masses for the residual nuclei adopted by (91AJ01, 93AU05, 93TI07). See also (83ANZQ, 89OG1B).