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400
Democritus-400 B.C.
He discovered the atom and that it was the smallest particle that existed. He based his experiments on his theoriese and natural curiousity. He thought that the atom looked like a ball.
Bennett, Linda. "What Democritus Thought." Democritus Model. N.p., 2012. Web. 18 Feb. 2015. -
Dalton
He added onto Democritus's theory by saying there are many different "flavors" of atoms. He spent time in labs observing many chemical reactions. He created the hypothesis that atoms had different "flavors". He thought that the atom looked like a billiard ball.
Bennett, Linda. "What Dalton Discovered." Dalton's Model. N.p., 2012. Web. 19 Feb. 2015. -
Thomson
He discovered the electrons because he wanted to know what the atoms were made up of. He studied the electric charges of the atoms and compared them to magnets. He thought that the atom looked like a chocolate chip cookie.
Bennett, Linda. "What Thompson Discovered." Thompson's Model. N.p., 2012. Web. 23 Feb. 2015. -
Rutherford
He discovered the nucleus of the atom, He used gold foil and shot alpha particles, that should have traveled though the foil,but it didnt happen. He believes that the atom looks like planets orbiting the sun, which he called the planetary model.
Bennett, Linda. "What Rutherford Discovered." Rutherford. N.p., 2012. Web. 25 Feb. 2015. -
Bohr
He discovered that the electrons have certain paths. He based his experiments mostly on math. He thought the atom looked like a nucleus with electrons circling in neat,little rings.
Bennett, Linda. "What Bohr Discovered." Bohr's Model. N.p., 2012. Web. 25 Feb. 2015. -
Heisenberg and Schrodinger
They discovered that you can't know the momentum and position of a particle at the same time. They used the Heisenburg's uncertainty principle, which states you can't know the momentum and position of a particle at the same time. They described the atom as vibrations on a violin string, but in closed circles.
Saffman, Mark. "Atom." World Book Advanced. World Book, 2015. Web. 25 Feb. 2015.
