Ineed to figure out how many decimals are mibed

Element before carbon on the periodic table

How many moles of oxygen react with 12 moles of aluminum

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.