Note- Date is BC
Aristotle didnt think atoms could be constantly moving if they were in a void. He beleived there were four elements and four qualities, and that they would align into their rightful place and be at rest.
1st Jan, 0440
Note- date is in BC
Beleived that if you continually cut a substance in half, eventually you would get an "uncuttable" piece. He called these uncuttable pieces particles, which means indivisible in greek.
He thought atoms were hard and small particles compiled by one substance and in one particular shape. He thought they were always moving and that they combined with each other.
He measured relationships between volume and pressure of gasses. From his expiraments he concluded that gasses are made up of tiny particles that group together to make different substances.
This man created the idea of having on single -common language for all of science to use. for example when someone called a substance iron, than everyone was to call it iron. This allowed for science to advance and for chemists to learn new properties of other metals and know how to organize them.
He claimed the reason elements combined was because all elements are made up of atoms. He also published a three- part atomic theory. 1. All particles are made of atoms, they cant be divided or destroyed. 2.Atoms of the same elements are identical diferent element's atoms are different. 3. atoms join with other substances to create new and different substances.
In 1904, Hantaro Nagaoka developed an early but incorrect planetary model of the atom. He based his model of the atom around the rings of the planet saturn. however his model was not created properly. He explained that the rings are held there due to its massive orbit. although this model was wrong it still allowed for the discovery of the atoms rings.
This man suggested that electrons travel around the nucleus in definite paths. These paths are always at a certain "level" away from the nucleus. He also stated that electrons cannot travel in between each path, however they can jump from one path to another.
Quantum Mechanical Model
The current day model of an atom is based on a theory of quantum mechanics. Each electron is thought of as a cloud, of negative charge, instead of one tiny negative particle. It is beleived in this model that electrons "occupy" all of the space in an atom at different levels or rings. An atom consists of energy levels, neutrons, and protons.