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Dalton's model
Dalton isn't fully the one who came up with this model. A theory that all matter is composed of tiny, indivisible elements was concidered as a phylosofical thaught in Greece and India. John Dalton was the first to turn this phylosophical thaught into a model with a rough evidence.
He did some experiments that thoretically allowed him to conclude that the atom looks like a simple shere. -
Thomson’s ‘Plum Pudding’ model
Thomson thaught that an atom is a sphere of positively charged meterial with tiny negatively charged ELECTRONS inside it. These were his discovery. He said they were more than two thousand times lighter than a hydrogen atom.
People accepted his Thomson's model. But not for very long. RUTHERFORT his student disproved it later on. -
Rutherford/Bohr model
"The planetary atom"
Rutherford came up with the idea of the NUCLEUS in the center of the atom. He also said that electrons circulate (in their orbits) at some distance from the nucleus. Just like planets around the sun. There the model's alternative name comes from. He also said that a atom is mostly EMPTY SPACE The positively charged material is in a tiny nucleus in the centre. The electrons move about this in definite spherical orbits. The rest is empty space. -
Period: to
First world war
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Schroedinger’s model
Schroedinger showed through math, that waves can be used to describe electrons in atoms. He made a 3-D like atom model. He said that you can find a electron in a certain cloud, that goes around another one, where you can also find a electron and so on until the nucleus. Where the cloud is denser, the electron is most likely to be. -
Period: to
Second world war
