Question

in a chemical reaction, what has to be the same on both sides of the reaction?
o the number of atoms and types of elements
o the size and color of subatomic particles
o the weight and atomic electrons
o the number of compounds and the coefficients

Explanation:

According to the law of conservation of mass in chemical reactions, the number of atoms of each element and the types of elements must be conserved. Sub - atomic particle size and color are not relevant to reaction balance. Weight and atomic electrons are not what must be the same on both sides in the way described. The number of compounds and coefficients can change during balancing to maintain atom conservation.

Answer:

the number of atoms and types of elements