350 beta-decay stable nuclides are currently known. Theoretically predicted or experimentally observed double beta-decay is shown by arrows, i.e. arrows point towards the lightest-mass isobar. This is sometimes dominated by alpha decay or spontaneous fission, especially for the heavy elements. Possible decay modes are listed as α for alpha decay, SF for spontaneous fission, and n for neutron emission in the special case of He. For mass 5 there are no bound isobars at all; there are bound isobars for mass 8, but the beta-stable one Be is unbound.