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Democritus (400 B.C.)
timetoast. Democritus d that you could cut things into such small pieces and called it an atom. He used observations. -
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Aristotle (mid 300 B.C.)
He believed that their weren't any atoms. He also used observations to make his discovery ristotle’s Contribution | Atomic Model History." Atomic Model History. N.p., n.d. Web. 26 Feb. 2014. -
Dalton (1766)
<a href='http://"Universe Today." Universe Today RSS. N.p., n.d. Web. 25 Feb. 2014' >dalton source </a>Discovered that all matter is made of atoms. Atoms are indivisible and indestructible.All atoms of a given element are identical in mass and properties. He used evidence and observations. Dalton's atomic model-- consists of pure elements of particles called atoms. -
Thompson
He used a wave to figure out that there are electrons. And in the atom there were these negative things. "Social." Indiana University Northwest. N.p., n.d. Web. 27 Feb. 2014. -
Rutherford
Did a gold foil experiment to test Thomson's model. Determined that there was a large nucleus with an overall positive charge. Along with Hans Geiger asnd Ernest Marsden. Every atom has a tiny nucleus (99%) of atom's mass). Gold Foil experiment and hypothesis. He had the planetary model .
"Rutherford Model of the Atom." Rutherford Model of the Atom. N.p., n.d. Web. 25 Feb. 2014. -
Bohr
Bohr joined in with Rutherford. He realized tat Rutherford's model was quite right. His theory was that electrons existed in sets or bits around the nucleus was the key to the periodic repition of properties of the element.
PBS. PBS, n.d. Web. 27 Feb. 2014. -
Heisenburg and Schrodinger
He shared through math, described electrons in atoms. Built Bohr's model o\f atom with electron cloud model. They used a mathematical model/method. They thought the atoms looked like a standing waves.
"Timeline of the Atom." : Erwin Schrodinger. N.p., n.d. Web. 27 Feb. 2014.
