h from the text. “For example, H is the symbol for hydrogen and O is the symbol for oxygen. Water is made up of both hydrogen and oxygen. H2O is the symbol for water. Two hydrogen atoms and one oxygen atom are bonded together to create a water molecule. Oxygen gas is made up of two oxygen atoms bonded together. O2 is the symbol for an oxygen molecule.” Based on this evidence, what can you conclude the 2 stands for?