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apr 7, 1803 - John Dalton's atomic theory

Description:

• All matter is composed of atoms
• Atoms cannot be made or destroyed
• All atoms of the same element are identical
• Different elements have different types of atoms
• Chemical reactions occur when atoms are rearranged
• Compounds are formed from atoms of the constituent
elements.

The different elements' atoms are distinguished by their weights.

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Date:

apr 7, 1803
Now
~ 215 years ago

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