"History of the Atom Timeline by (Ja'Mecia P. and Tahj P.)

Democritus Atom in 400 B.C.

100

Democritus stated that the atom was the smallest piece of an

object that cannoot be broken down into any smallelr pieces. Democritus was the founder of the atom. Williams, Matt. "John Dalton's Atomic Model." Universe Today. N.p., 01 Dec. 2014. Web. 20 Feb. 2015.

Dalton atom

Feb 25, 1803

Dalton stated that the atome is comprised of electrons and nuetrons and he also agreed with Democritus and stated that the atom is the smallest piece of an object and he used the model billard balls.
Bennett, Linda. "What Dalton Discovered." Dalton's Model. N.p., 2012. Web. 24 Feb. 2015.

Thomson Atom

Feb 25, 1909

He said that the atom is made up of protons and nuetrons. He used the scientific theoroy to come up witht this discovery. Dewiit. "Thomson Model of the Atom." GaggleTube Video - Models of the Atom Timeline. N.p., n.d. Web. 19 Feb. 2015.

Rutherford

Feb 25, 1911

Rutherford discovered that the nucleus is positively charged and depending on the atoms it reflects back on the alpha particles. He said the positive charge was in the middle of the atom.Ernest Rutherford used the "Gold Foil Experiment" to discover atoms.
Dewitt, Tyler. "GaggleTube Video - Discovery of the Nucleus: Rutherford's Gold Foil Experiment." GaggleTube Video - Discovery of the Nucleus: Rutherford's Gold Foil Experiment. N.p., 12 Nov. 2013. Web. 20 Feb. 2015.

Bohr

Feb 25, 1913

Bohr discovered that the electrons were not randomly floating around, so he added rings into his model and put them neatly on there. He learned that the negatively charged electrons would be attracted by the nucleus (positive). To conclude, opposites attract.
Bennett, Linda. "What Bohr Discovered." Bohr's Model. Linda Bennett, 2012. Web. 20 Feb. 2015.

Schrodinger

Feb 25, 1926

He came up with an equation that allowed him to find the energy levels of the electrons.