86Sr has 38 protons and 48 neutrons.
86Sr is a stable isotope.
The mass excess of 86Sr is -84523.09977 with an uncertainty of ±0.00524.
The mass was measured using a Penning Trap and the related equations include:
Influence Equations
53.5% 86Sr-84Kr1.024 1
46.5% 86Sr-86Kr 1
Reference
1. R. Rana, M. Hocker, E.G. Myers (2012) Atomic masses of strontium and ytterbium
Physical Review A 86(5)
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.86.050502