Significance of Experiments that Showed Evidence for the Existence of Atoms

Law of Conservation of Mass 

“Building Blocks” are not created or destroyed, they are rearranged in reactions.

Law of Definite Proportions

“Building Blocks combine in specific ratios for different compounds.

Atomic Theory 

Coined the term “atoms” and rephrased the Law of Conservation of Mass and the Law of Definite Proportion in terms of atoms.

Law of Multiple Proportions

atoms combine in ratios of small integers.

Avogadro's Hypothesis

Thinking in terms of “particles” is better than thinking in terms of Mass.

JJ Thomson's Cathode Ray Tube Experiment

Measured the charge-to-mass ratio of electrons

Milikans Oil Drop Experiment

Measured the charge of an electron.