83Kr has 36 protons and 47 neutrons.
83Kr is a stable isotope.
The mass excess of 83Kr is -79990.643 with an uncertainty of ±0.009.
The mass was measured using a Penning Trap and the related equations include:
Influence Equations
100% 83Kr-84Kr0.988 1
Reference
1. M. Hocker, R. Rana, E.G. Myers (2013) Atomic masses of 82,83Kr and 131,134Xe
Physical Review A 88(5)
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.88.052502