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How do you know which element the little number (subscript) goes with?
the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.
there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
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