British physicist (born in New Zealand) who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937) Unfortunately, it did not explain how the electrons were arranged or why they didn't fall into the oppositely charged protons.
Th scientist who made an atomic theory. It wasn't accepted at first, but he still used it to predict how a pair of elements might combine. He said the atom looked like a bowling ball.
Proved Law of Conservation of Mass. (Mass is neither created nor destroyed.)
Conducted and experiment in which he determined the mass of an electron and the actual charge.
Was the first to suggest the world was made of atoms. However, he had no proof, and therefore no one believed him.
With the help of Rutherford, he showed the nucleus a neutral particle called the neutron.
Worked with the cathode ray tube and concluded that atoms emitted negative particles. These are now called electrons.
He was the first scientist to emphasize the need for experimental data and he gave us the experimental definition of an element.
Did not believe in atomsand viewed matter as continuous. He believed the elements were earth, fire, water, and wind.
Created the "plum pudding" model of an atom. Said that atoms had a uniform body of positive spongey material with negative electrons scattered throughout.
Stated the Law of Definite proportions (constant composition)