Why did the model of the atom change? A. New materials became available to build better models.
B. The structure of atoms changed over time.
C. Scientists did not like the original model.
D. Experiments provided new evidence about the atom.

A.

Los modelos atómicos cambian de acuerdo a nuevas investigaciones y nuevos descubrimientos, que nos ayudan a acercarnos a la forma real de un átomo y como este está compuesto.

i believe the answer is a.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.