Information on mass chains and nuclides available on this website:

WWW TUNL

¹⁸Be has not been observed: it is predicted to have a mass excess of 78.43 MeV (JA76M). 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, 3.1, 3.0, 5.45, 3.17, 4.92, 1.75 and 1.25 MeV using the masses for the residual nuclei adopted by (WA77, 80AJ01, 81AJ01).