How do you determine the atomic weights of zinc or copper and what additional information is necessary in order to do this?

To determine the atomic weights of zinc or copper, you typically use mass spectrometry or chemical analysis techniques to measure the isotopic composition of the elements. You need to know the relative abundances of the isotopes present and their individual atomic masses. This data allows you to calculate the weighted average atomic weight based on the formula: atomic weight = (isotope mass × relative abundance) for all isotopes. Additionally, knowledge of the isotopic ratiOS in the sample is essential for accurate calculations.