Dalton ModelBritish chemist John Dalton believed that even though you couldn't see it, all matter was made up of small, seperate particles called atoms. Each element was made up of atoms that are alike, and different atoms could have different masses.
Thomson ModelJ. J. Thomson was a British scientist who discovered the electron. He created a new model, saying that an atom is actually a positivly charged sphere with electrons embeded within it.
Nagaoka ModelJapanese physicist Hantaro Nagaoka thought that the atom looked like a large sphere with positive charge in the center. Electrons revolved around the sphere, like how planets revolve around the sun.
Rutherford ModelThe Rutherford model is probably the most commonly known model for the atom. Rutherford theorized that an atom is mostly empty space. Electrons would orbit randomly around a small, positively charged nucleus.
Bohr ModelNeil Bohr was a Danish physicist. His proposal was that an atom had a positively charged center and was orbited by specific layers of electrons. He also believed that the atoms would either give off or absorb energy when electrons moved from layer to layer.
Schrödinger ModelErwin Schrödinger was an Autrian physicist. He believed that electrons weren't actually particles, they were waves that carried information. Electrons looked like different-shaped clouds as they circled the nucleus.
Chadwick ModelJames Chadwick, a British physicist, discovered neutrons. By descrovering the neutrons, he was able to explain why atoms were heavier than the mass of their protons and electrons.