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400
Democratis (B.C.)
The approximent year of his discovery was 400 B.C. He discoverd that all matter contains atoms. Also that matter can't be broken down anymore. Democratis used observations to discover that. Democratis thought it looked like a marble. -
400
Aristotle (B.C.)
Approxiamtely the year that Aristotle made his discovery is 400 B.C. He didn't believe in atoms and he didn't add anything. He just believed in his theory. -
Dalton
Dalton discoverd that stuff can be broken down elements. He added the atoms with small things with different mass and properties. He use mathematical models. He thought the atom looked like a marble. -
Thomson
He discovered atoms have electrons. He use evidence form experiment. He pictured it like a blue berry muffin. -
Rutherford
He discovered the atoms have a nucleus and he added that the electron are orbting around the nucleus. Also found that all the weight of the atom is in the nucleus. He used evidence from experiment. He thought it looked liked a plantary system.