76Se has 34 protons and 42 neutrons.
76Se is a stable isotope.
The mass excess of 76Se is -75251.959 with an uncertainty of ±0.016.
The mass was measured using a Penning Trap and the related equations include:
Influence Equations
100% 76Se-84Kr 1
Reference
1. B.J. Mount, M. Redshaw, E.G. Myers (2010) Double-β-decay Q values of 74Se and 76Ge
Physical Review C 81(3)
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.81.032501