Chemistry

Chemistry

1. Discoveries

   • Democritus
     • Idea of a Atom
   • Dalton
     • Atomic theory
       • the theory that all matter is made up of tiny indivisible particles (atoms). According to the modern version, the atoms of each element are effectively identical, but differ from those of other elements, and unite to form compounds in fixed proportions.
   • Thompson
     • Plum Pudding theory; discovered electrons
   • Rutherford
     • Gold foil experiment; discovered protons & nucleus
   • Bohr
     • Solar system model (orbits); electron location

2. Atoms

   • Positive = protons.
   • Negative= electrons
     • Volume
   • Neutral = neutrons
     • Protons and neutrons are located inside the nucleus
       • Mass
   • Protium 1 P/E O N Deuterium 1 P/E 1 N Tritium 1 P/E 2 N

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