For Conservation of mass and balanced chemical equations, which option best supports this Unit 4.3 objective: Balance symbol equations by making the number of atoms of each element the same on both sides?

The correct option is The number of atoms of each element is the same on both sides.

The correct option is The number of atoms of each element is the same on both sides. The number of atoms of each element is the same on both sides is correct because it directly supports the approved learning objective to balance symbol equations by making the number of atoms of each element the same on both sides. The reasoning belongs to Conservation of mass and balanced chemical equations within Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term symbol equation to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.