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340 BCE
Aristotle Atomic Theory
Aristotle did not believe in the atomic theory, in fact he believed in 4 elements, otherwise known as, Fire, Water, Earth and Air. He thought that every material to ever be created consisted of little amounts of the 4 elements, this was also his theory. Everyone had seemed to have believed him, so his theory of the 4 elements was carried on for 2,0000 years, until finally Democritus theory was proven right. Although Aristotle was wrong, his theory being proven wrong was a help for the future. -
442
Democritus Atomic Theory
Democritus Theory is based upon how matter is made with atoms. He stated that atoms are unbreakable and immutable. Democritus also discovered that if you took a piece of stone and cut it in half repeatedly you would eventually reach to a size which would be uncuttable, he called these small pieces atomos, which means that they are indivisible. If it weren't for Democritus we would never know what atoms are! -
442
Democritus Atomic Theory pt.2
We would live a life without knowing what matter consists of and how their was a single matter that was just modified many times -
John Dalton Atomic Theory
The John Dalton theory was based on growing the law of many proportions. John had believed that the atomic theory could explain why water can absorb different gases in different proportions. He proposed after his experiment that every chemical element is made up of atoms that cannot be changed or demolished so instead they can be merged together. in conclusion all atoms are identical, but may vary in mass and size if its from a different element. -
John Dalton Atomic Theory pt.2 (Contribution)
Without Johns Contribution to the atomic theory we wouldn't have know how the proportions of different elements worked in atoms. -
Thomson Atomic Theory
Thomas created his model that was made up electrons of negatively charged "plums" and positively charged "pudding", he dropped the theory he had created before and moved on. Then after Thomas had done the gold-foil experiment, he exhibited that an atom has a very tiny yet a giant mass nucleus. Thomas has greatly contributed to the atomic theory, because without him we wouldn't have known that the nucleus holds great power in the atom, it also help introduce us to the real truth of the nucleus. -
Rutherford Atomic Thoery
Thomson experiment had been handed to Rutherford. While in Rutherford's experiment he had noticed that there were many "Alpha" particles coming in little angles from the nucleus. He later realized that Thomas's theory was false. Rutherford concluded that nucleus was actually consisted of 2 protons and 2 neutrons. Without Rutherford we all would have still believed in Thomson's false theory. The real truth would've been hidden. -
Niel Bohr's Atomic Theory
Niel Bohr made a theory where he explained why atoms emitted light in fixed wavelengths. He also explained what happened inside an atom and made a photo of the atomic structure. His model of the atom is small, an positive charged nucleus in the middle and it is surrounded by electrons. Niel was the first one to discover that all electrons move in their own movements. His work contributes to the theory with his model and picture of the atomic structure. -
Niel Bohr's Atomic Theory pt.2
If it weren't for his picture and model we wouldn't have been able to study atoms properly. -
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Niel Bohr's work
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Werner Heisenberg atomic theory
Werner had created an uncertain formula, which consisted of matrix algebra. He was the creator of quantum mechanics. He created a application which lead the way to uncover multiple forms of hydrogen. He discovered and made the neutron-proton model in the nucleus. Without Werner's contribution to the atomic theory we would have never known about the neutron-proton model, and about the overall charge in the atom staying as uncharged and neutral, with the proton adding and the electron decreasing.
