Someone good with science please help me out !!? Problem 1 Determine the average atomic mass for silicon using the data below Isotope | % Abundance | Atomic Mass | Mass Number | ________________________________________________ 28si | 92.23% | 27.9769u | 28 | ________________________________________________ 29si | 4.67% | 28.9765u | 29 ________________________________________________ 30si | 3.10% | [...]