What must be balanced on the left side of an equation with the atoms on the right side of the equation? total number of molecules total number of atoms total number of compounds free electrons

The total number of atoms must be the same on both sides in order for it to be a balanced chemical equation.

where's the diagram?

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.