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Aristotle and Democritus had ever different ideas of what an atom was. Democritus described an atom an a hard partical that was indivisible and Aristotle said that an atom was made up of fire, water, earth, and air. This was the main difference between their ideas.

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Later we found that electrons do not move around the nucleus like a planet moves around the sun. Electron do not follow a concrete path. This is called a wave quantum mechanics. Electrons move around in clouds and the probability of an electron being in a certain place is based on how much energy the atom has. The electrons with the lowest energy will be found closer to the nucleus and the electrons with the greatest amount of energy with be found the furthest from the nucleus. However it is impossible to figure out where an electron will be in its orbit.
http://images.slideplayer.com/23/6577092/slides/slide_43.jpg

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James Chadwick was the first person to discover the neutron. He ended up winning the Nobel Peace Prize in 1935.
Quizletgoo.gl/23fJAx

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In 1926 Erwin Schrodinger
took the Bohr model and used math to describe the likelihood of an electron being in a certain position while it orbits around the nucleus.
http://www.abcte.org/files/previews/chemistry/s1_p6.html
http://a2.files.biography.com/image/upload/c_fit,cs_srgb,dpr_1.0,h_1200,q_80,w_1200/MTIwNjA4NjMzOTY2MjY1ODY4.jpg

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Henry Moseley was the first to find out that all atoms in given elements contained the same number of protons in the nucleus.goo.gl/5z5ys1

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In 1908 English physicist Rutherford was interested in figuring out the structure of an atom. So he came up with an experiment where he would shoot positively charged particals through a very thin layer of gold sheet. Most of the particals went straight through but some bounced back suggesting they had hit something solid and positive. This led the discovery of the nucleus which was a small, dense, positively charged center. He also found that an atom was mostly empty space. This caused his diagram of an atom to have a small positively charged center with negative particals spread throughout the outside.  https://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Ernest_Rutherford_1908.jpg/220px-Ernest_Rutherford_1908.jpg

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In 1803 Dalton, an English chemist, performed many experiment that led people to except the idea of atoms. These experiment helped him create Dalton's Theory. He found that atoms make up elements and atoms are indivisible and indestructible. He developed the idea that atoms of the same element are exactly alike but atoms of different element are different. Finally, the joining of two or more element creates a compound.  Little did he know that this theory would become the base of modern day chemistry. https://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/John_Dalton_by_Charles_Turner.jpg/240px-John_Dalton_by_Charles_Turner.jpg

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Niels Bohr developed the idea of different energy levels and the orbit model. He says that certain amount of electrons are on specific energy levels. The electrons surround the nucleus.
Class Notesgoo.gl/vaE17

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J.J. Thomson said that there are different things in atoms. He studied the passage of electric current through a gas. It gave off rays of negatively charged particles. He found out atoms are divisible. He came up with the Plum Pudding Model.
Class Notes goo.gl/lVZlwk

Plum Pudding Model

goo.gl/zfT5nB

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Aristotle also a philosopher during 400 B.C. had the idea that an atom contained earth, fire, water, and air. However this idea could not have been further from the truth. Aristotle was more respected then Democritus. Therefore Democritus's idea was put aside for 2000 years. goo.gl/fNeDI9

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The atomic model has changed throughout the centuries, starting in 400 B.C. when Democritus had the idea of Atomos.
Class Notesgoo.gl/3abKww