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Confirmed existence of neutrons.

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1926-The Electron cloud/ Quantum Mechanical Model of the Atom

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1926-The Electron cloud/ Quantum Mechanical Model of the Atom

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This comes from the mathematical solutions to the Schrodinger equation. It determines the allowed energies an electron can have and how likely it is to find the electron in various locations around the nucleus.

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developed mathematical equations to describe the motion of electrons of atoms.

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Found the amount carried in charge from an electron.

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This is showing that electrons move in specific circular paths(orbits) around it's nucleus.

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Believed that electrons moved in a fixed circular orbit

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In this model the protons and neutrons are found inside of the nucleus and the electrons are around it in mostly empty space.

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Found that atoms have small dense positively charged atoms in the nucleus.

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J.J Thomson discovers the electron and thinks that they will look like embedded circles in a sphere.

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Discovered the electron leading to his plum pudding model.

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Observed Cathode ray tubes and found that they move in different directions than cathode rays he called them Canal Rays.

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1.) All elements are composed of tiny indivisible particles called atoms.
2.) Atoms of the same element are identical. The atoms of any one element are different from those of any other element.
3.) Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds.
4.) Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction.

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Began modern process of discovery regarding atoms.

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460 B.C Democritus' Philosophy of the Atom

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460 B.C Democritus' Philosophy of the Atom

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Believed that atoms were indivisible and indestructible and in later research by scientists proved that he was correct.

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First to express the existence of atoms, but didn't have enough information to prove that they were real.