Draw a conclusion on how the relative abundances of naturally occurring isotopes relate and can be used to determin average atomic mass of an element. Average atomic mass comes from the isotopic The different masses of isotope electrons gives the nuclear mass proportioned by the relative relative abundance and atomic mass of the isotope abundances Isotope masses are weighted by their relative Calculating the atomic mass comes from the numb B) abundances and then add to give the average D) protons and the relative abundance of the isotopes atomic mass​