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Updated: 9/28/2020
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  • indivisible and indestructible building blocks
  • All matter is composed of atoms
  • The Atomic Theory:
  • Mr.Dalton
  • 1803
  • While all atoms of an element were identical, different elements had atoms of differing size and mass.
  • All atoms contain tiny negatively charged subatomic particles
  • There are negatively charged particles embedded in the "positive soup"
  • Mr.Thomson
  • 1897
  • The atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus The nucleus is positively charged and surrounded at a great distance by the negatively charged electrons
  • Mr. Rutherford
  • 1911
  • Energy is transferred only in certain well defined quantities Electrons should move around the nucleus but only in prescribed orbits When jumping from one orbit to another with lower energy, a light quantum is emitted.
  • 1913
  • We cannot measure the position (x) and the momentum (p) of a particle with absolute precision The more accurately we know one of these values, the less accurately we know the otherWe call this the Uncertainty principle
  • 1927
  • 1932
  • After doing my experiment, I (James Chadwick) have hound neutral charged particle with the approximate mass of a proton. They are called neutrons
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