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384 BCE
Aristotle
Aristotle thought that if you put enough thinking into something you could figure the problem out. He believed that everything was made of the four things. Water, Fire, Air, and Earth. His was 'hyle'. -
384 BCE
Aristotle Atom
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360 BCE
Democritus
Democritus was an Ancient Greek pre-Socratic philosopher. HE believed that everything was made out of two different building blocks. One being the void, and the other being atoms. He said that there was unlimited number of them -
360 BCE
Democritus Atom
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330 BCE
Plato
Plato introduced the atomic theory in which ideal geometric forms serve as atoms, he believed that atoms broke down into triangles. Each elements had their own shape. Fire (pyramid), Air (octahedron), Water (icosahedron). Earth (circle). -
6 BCE
The Alchemists
Alchemy originated when Aristotle took up an older idea that all matter combined the four elements of earth, air, fire, and water. He guessed that these elements could be changed -- transmuted -- by the action of heat and cold, or dampness and dryness -
130
Plato Atom
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1160
Henry G. J Mosely atom
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1404
“Plum Pudding” Model
by J. J. Thomson -
Henry G. J Mosely
Henry Moseley was a English physicist who experimentally demonstrated that the major properties of an element. He showed that elements are determined by the atomic number, not how much the atom weighed. -
Lavoisier
Antoine Lavoisier was the first person who used a balance. He was called the "father of modern chemistry" -
Lavoisier atom
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John Dalton
John Dalton FRS was an English chemist, physicist, and meteorologist. He showed the atomic theory by using chemistry. He also had a interest in color blindness. -
John Dalton Atom
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Dmiri Mendeleev
Russian chemist Dmitri Mendeleev wrote down the symbols for the chemical elements, putting them in order by how much the atom weighed, resulting in him inventing the periodic table. -
Dmiri Mendeleev
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Ernest Rutherford
Ernest Rutherford was known as "The father of nuclear Physics" He was the first person to discover that there were two types of radiation. Alpha being the first and beta particles being the second. He also found the atoms were basically made out of mostly empty space. It had a mass that positively charged the Nucleus. -
Ernest Rutherford
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Solid Sphere of “Billiard Ball” Model
"Solid Sphere Model" or "Billiard Ball Model" proposed by Dalton -
The Curies
The Curies had a element named after them. Three other radioactive minerals were also named after the Curies. Curite,Ssklodowskite and Cuprosklodowskite. -
Robert Millikan
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Solar System Model
Neils Bohr came up the Solar system model of the atom in 1913. -
Neils Bohr
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Electron Cloud Model by Erwin Schrödinger and Werner Heisenberg
The electron cloud model was developed in 1926 by Erwin Schrödinger and Werner Heisenberg. -
J.J Thomson
J. Thomson is credited with the discovery of the electron, that being the negatively charged particle in the atom. -
J.J Thomson Atom
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Neils Bohr
Neils Bohrs greatest discovery to modern physics was the atomic model. The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons. -
Robert Millikan
Millikan thought his cosmic ray photons were the "birth cries" of new atoms continually being created by God to interact entropy and prevent heat death. -
Robert Boyle
Robert Boyle was known as “The Father of Chemistry” his discovered that atoms have to be based on a relationship between pressure and volume of gas. His theorem is called Boyle’s Law. -
Robert Boyle
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Werner Heisenberg atom
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Werner Heisenberg
Werner Karl Heisenberg was a German theoretical physician. He made a paper that had the subsequent series in it including Max Born and Pascual Jordon. -
Albert Einstein
Albert Einstein wrote a letter to President Roosevelt in 1939, warning of possible German nuclear weapons research and proposing that the United States begin its own research into atomic energy. -
Albert Einstein atom
