How many neutrons are found in the unstable isotope phosphorus-36?
The atomic number,
Atomic mass is ALWAYS determined by the number of nuclides, massive nuclear particles (protons or neutrons). Of course, the number of protons (
To account for the given atomic mass, there must be 21 neutrons in the nucleus. This is possibly a very short-lived isotope. Nucular chemistry and physics are not my strong suites.