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the area of chemistry that deals with the relative quantities of reactants and products in chemical reactions. Often working with mole ratios in a chemical reaction. The balancing numbers in a chemical reaction give us a mole ratio.
an atom of an element that loses or gains an electron and becomes electrically charged.
the mass of a formula unit relative to one atomic mass unit.
a zigzag, stepped line on the periodic table that separates the metals from the non-metals.