what must be balanced on the left side of an equation with the atoms on the right side of the…

what must be balanced on the left side of an equation with the atoms on the right side of the equation?\n\ntotal number of compounds\ntotal number of molecules\nfree electrons\nnumber of atoms of each element
Answer
Brief Explanations:
In a chemical equation, the law of conservation of mass requires that the number of atoms of each element on the left - hand side (reactants) must equal the number of atoms of each element on the right - hand side (products). Compounds, molecules, and free electrons are not what is directly balanced in terms of atoms.
Answer:
number of atoms of each element