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460
Democritus
the atoms were small hard particles that were made of the same material but were differnt shapes and sizes methos used - when he took bread a broke it up he thought it looked like a marbel
http://profmokeur.com/chemistry/history_of_the_atom.htm -
Dalton
He discovered that the atom had matter consist of indivible atom.atoms were aranged in different combinations to make different compounds. The method he used is theory of matter based on his experiment obervations -
Bohr
He said that electrons orbit around the atom. He joined Rutherford,but didnt think his model was quiet right.He discorved that protons, neutrins,electrons were orbiting the atom -
Aristotle 300 BC
he didnt believe in the atomis theory the method used - he used the four elements earth fire water and air he believe every living thing was made up of those things -
Thomson 1856 -1940
he dicoverd that atoms have tiny negaivte charged particles inside them (Electons) method used - atoms which is known as plum pudding model or christmas pudding or choclate chip cookie model he thought all the problem and electrons we all toghether -
Rutherford 1911
most alpha particles went right through the solid foil but to his amazement a few alpha particles rebound alomost directly back wards method used - foil expiremnt gold alpha partically
