Question

Which two terms out of the 3, relate, and why?

4. atomic mass, compound, isotope
5. electron, ion, neutron
6. atomic number, isotope, radioactive
7. compound, ion, proton
8. energy level, neutron, spectral line

Answer 1

5. Electron and neutron- both are parts of the makeup of an atom
6. Atomic # and isotope- all isotopes of an element have the same # of protons, an elements atomic # is the # of protons that element has
(Those are all i know so if anyone else could chip in, that would be great!)