History of Atoms

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  • C. 5th Century BC
  • There should be an infinite number of atoms that can not be destroyed.
  • There are small particles that can not be divided called atoms. Voids separate atoms.
  • 332 BC
  • Whoever came up with the ideas of atoms is ridiculous. Everything is obviously made of the four elements, Earth, Fire, Water, and Air.
  • Around 1800
  • Maybe that Democritus was right about atoms.
  • Democritus (born in Abdera and lived from c. 460 BC - c. 370 BC) adapted the atomic theory from his mentor, Leucippus (born in Abdera and lived during 5th century BCE). They are both known as the originator of the atomic theory.
  • Aristotle (born in Stagira and lived from 384 BC - 322 BC) did not believe in the atomic theory and thought that all materials on Earth were made of the four elements, Earth, Fire, Water, and Air. Most people followed his idea because he was more well-known.
  • British chemist John Dalton (born in Eaglesfield, Cumberland and lived from 1766 - 1844) revived Democritus's ideas and he taught and researched about it. He came up with three ideas: All substances are made of atoms and atoms cannot be created or destroyed, all atoms of the same element are alike and have the same mass, and atoms join together to form compounds. Dalton's theory was widely accepted.
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