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In 1803, John Dalton proposed his Atomic Theory, which established 4 very important principles of the atom based on upon measurable properties of mass. The principles are outlined below.
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- All matter is made of atoms, which are invisible and indestructible.
- All atoms of a given element of a given element are identical in mass and properties.
- Compounds are formed by a combination of 2 or more different kinds of atoms.
- A chemical reaction is a rearrangement of atoms.
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