Democritus: Democritus believed that atoms existed, he believed that cutting an object until it's a tiny particle would be an atom. Whereas Aristotle did not believe in atoms and believed that the world consisted of the four elements (Air, Earth, Fire, and Water)
Dalton: the five principles of Dalton's Atomic Theory was that all matter is composed of very small partial particles called atom's which cannot be subdivided, created or destoyed; Atoms of a given element are identical in their physical and chemial properties; Atoms of a given element diffe from their physical and chemical properties; atoms of different elements in simple, whole-number ratio to form compound; and finally in chemical reactions atoms are combined separated or rearranged but never created, destroyed, or changed. However due to modern day discoveries the host two principles are incorrect, because atoms can be subdivided into protons and electrons. Also all atoms are different, none are identical because they can be broken down into protons and electrons.
Thomson: In Thomson's life he conducted the cathode ray experiment. Thomson concluded that cathode rays are made up of invisible negatively charged particles called electrons. Thomson came to that conclusion when he discovered that the path of the ray…show more content… Bohr questioned Rutherford's discoveries by asking why electrons are not attracted to the positive nucleus. Bohr came to that conclusion that electrons are arranged in circles around the nucleus and that each circle has an energy level. Hw came to that conclusion by experimenting with light and how it interacted with matter. The difference between Bohr's energy model and Rutherford's model was just that Bohr believed that electrons were arranged in circles around the nucleus. According to the Quantum Theory Bohr's model is incorrect because electrons do not orbit the nucleus, because the electrons are found in orbitals which are regions of