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Plato came up with a theory that asserts the physical world isn't the only thing in existence. Instead, there is more to existence than just Earth. -
Democritus was an important man to the development of the atomic theory. He theorized that all material bodies are made up of atoms. -
Robert Boyle stated that when the volume of a gas decreases the pressure increases. -
Antonio Lavoisier found out that the total mass and reactant in a product are always the same. This led to the Law of Construction and Mass. -
John Dalton thought atoms were the smallest particle of matter. He envisioned that atoms were hard solid spheres, hence he created models like a billiard ball. Dalton made it to where atoms are together and would be hooked up as a model compound. -
The Alchemists broke the 4 elements durring its period. In order to do this, they laid out a foundation, which is now the periodic table. -
John Dalton was the man that created the atomic theory. This stated that all matter is composed of small, indestructible particles called atoms. -
Dimitri Mendeleev found out that all known chemicals would be arranged in order of increased atomic weight. This resulted in the Periodic Table being displayed are in an occurring pattern.
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Robert Millikan discovered that there is a fundamental change in a charged electron.
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Piere and Marie Curie together found out that inside uranium minerals there are strong radioactive elements in them like polonium and radium.
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Neils Bohr proposed a theory for hydrogen atoms. The theory was based on the quantum theory and stated that some physical quantities only take discrete volumes. -
JJ Thompson proposed the Plum Model of an atom that was negatively charged with electrons embedded in a positively charged one. -
Alber Einstein is the most famous and revolutionary scientist ever. He mathematically proved the existence of atoms. -
Ernest Rutherford found out that an atom is mostly made up of empty space, with almost all of its mass in the nucleus. -
Neils Bohr created the solar system model for the atom. It states that atoms consist of a nucleus with a certain amount of electrons that orbit the nucleus. -
JJ Thompson demonstrated that all atoms contain tiny negatively charged subatomic particles. -
Henry G.J. Mosely found out that the atomic number in an atom is the number of positive changes. -
Erwin Schrodinger showed that the quantization of hydrogen atoms energy showed up on Neils Bohr's atomic model and it could be calculated using his equation.
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Erwin Schrodinger made the Electron Cloud Model. This model consists of a dense nucleus that is surrounded by a cloud of electrons. -
James Chadwich discovered that atoms consist of not only protons and electrons but also neutrons.
