Democritus thought that the atom was unbreakable because of how small it was
Proposed the law of conservation of mass, which states that matter isnt created or destroyed in normal chemical reactions.
Stating that chemical compounds always combine in constant proportions.
Proposed with spherical solid masses in motion. Atoms cant be made or destroyed.
Where the first to produce electricity.
William discovered certain properties of cathode rays.
He discovered atoms as a ball of positive charge containing a number of electron and discovered the electron.
Gold foil experiment determined that the nucleus of an atom is very dense and has a positive charge.
Marie discovered the decay process radioactivity.
Oil drop experiment to be able to measure the charge of a single electron as a result of his experiment.