-
400 BCE
Democratus model
-
400 BCE
Democratus model
The model represents the atom as an shpere, there was no experiment to justify his conlcusions as by the time they where no technology
democratus concluded that all things where made by atoms and that there where undivisable, this contributed a lot in the early chemistry because he explain that all was made by atoms
The model was wrong beacse there where no subatomic particles as the protons and neutrons and nether a nucleaus that contain the mas only a simple shpere -
Dalton model
-
Dalton model
Dalton's Atomic Theory or Dalton's Laws: Atoms are small, chemically indestructible particles of matter. Elements consist of atoms.
Atoms of an element share common properties.
Atoms of different elements have different properties and different atomic weights.
Atoms that interact with each other obey the Law of Conservation of Mass. -
Thomson model
-
Thomson model
Thomson held that atoms are uniform spheres of positively charged matter in which electrons are embedded. Popularly known as the plum pudding model, it had to be abandoned (1911) on both theoretical and experimental grounds in favour of the Rutherford atomic model, in which the electrons describe orbits about a tiny positive nucleus. -
Rutherford model
Rutherford's new model[1] for the atom, based on the experimental results, contained new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom and with this central volume also containing the bulk of the atomic mass of the atom. This region would be known as the "nucleus" of the atom. -
Rutherford model
-
Neils Bohr model
-
Neils Bohr model
Bohr atomic model incorporated quantum theory. Bohr´s model describe the properties of the atomic electrons and explain how electrons can have stable orbits around the nucleus.
He concluded that the energy of an electron depends of the size of the orbit and is lower for smaller orbits. -
Erwin Schrödinger model
-
Erwin Schrödinger model
He used the Bohr atomic model to improve it. He stated that, unlike the Bohr atomic model, his quantum mechanical model does not define the exact path of an electron, but it predicts the odds about the probabilities of the location of the electron.
He concluded that the nucleus is surrounded by an electron cloud, and that means that the probability of finding the electron is more greatest.
