Scientist's models and theories
6 amazing models and theories
Ancient Greek Model
Scientist: Democrates, and AristotleYear of discovery: 400b.c., & 350b.c.
In 400b.c. Democrates believed that you could cut an object in half and eventually you would get down to a small particle that could not be divided. In 350b.c. Aristotle added that matter would come in 4 elements, earth, air fire, and water.
Year of discovery:1803
He theorized that atoms are like tiny sphere's, and that all matter is made of atoms. Elements of the same kind were made of the same type of atom. Different elements were made of different atoms, and different combinations of different atoms.
Year of discovery: 1897
In 1897 he proposed that atoms were spheres of positive electricity and had pieces of negative electricity floating around in it. He called these electrons and the entire model the "Plum Pudding" model. This was a big discovery because he was the first one to figure out that there was such thing smaller than an atom. This later led him to a Nobel Prize
Year of discovery: 1908
Rutherford took a big leap in finding out what atoms look like today. Previous model only showed a box or sphere. In 1908 he did an experiment where he shot gold foil in to an atom, most of it went through telling him it was mostly empty space. He also discovered that there was a nuclear with a positive charge and electrons fly around it. Yet he had still not discovered protons and nuetrons.
Year of discovery: 1913
Bohr's model consists of the nuclear made of protons and nuetrons, and the electrons orbiting it. If we could see the electrons they would be a blur because of how fast they are moving. In excercises we do today we make it look like the electrons have one orbit but they actually change orbit every time.
Broglie & Schrodinger model
Year of discovery: 1920's
Broglie and Schrondiger developed the "electron cloud" model. They said that the Bohr model was incomplete. Instead they said the electrons in the electron cloud, around the nuclear. Their main idea was that the electrons behaved like particles and waves.