If 1.85 g al reacts with an excess copper(ii) sulphate and the percentage yield of cu is 56.6%, what mass of cu is produced

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.