Chlorine-37 is a stable isotope of chlorine containing protons and neutrons. Its mass number is , which is distinct from its measured relative atomic mass and from the average atomic weight of a natural chlorine sample.
NIST's representative isotopic composition lists about chlorine-37 and chlorine-35.[ref]
Atomic Weights and Isotopic Compositions for All Elements by National Institute of Standards and Technology. Chlorine entries: masses 35 and 37 and their representative abundances
The two stable isotopes explain characteristic peaks separated by two nominal mass units in chlorine-containing mass spectra. Exact peak patterns also depend on the number of chlorine atoms and other isotopes present. Articles by others on the same topic
Chlorine-37 (\(^{37}\text{Cl}\)) is an isotope of chlorine, which is a chemical element with the symbol Cl and atomic number 17. It has a nuclear mass number of 37, meaning it contains 17 protons (which is characteristic of all chlorine atoms) and 20 neutrons (since 37 - 17 = 20).