Using the isotopic data below, calculate the weighted average atomic mass to three significant figures and then decide which candidate element best matches your result. Briefly justify why the other two candidates can be eliminated.
Isotope data for the unknown:
63.9291 u, 48.6 %
65.9260 u, 27.4 %
67.9248 u, 23.9 %
Candidate elements (tabulated atomic masses): Cu = 63.55 u, Zn = 65.38 u, Ga = 69.72 u.