Chapter 2

Chapter 2

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  • Everything here is made up of atoms!
  • 1803
  • 16 Mass Units
  • 2 Mass Units
  • 18 Mass Units
  • Print his periodic table and put here
  • 1864
  • John Dalton discovered that all matter is made of atoms, atoms are invisible and indestructible, all atoms of a given element are identical in mass and properties, compounds are formed of two or more different kinds of atoms,  and a chemical reaction is a rearrangement of atoms.
  • Print his periodic table and put here
  • 1869
  • Dalton based his theories on the idea that only like atoms in a mixture of gases repel, whereas unlike atoms appear to react indifferently toward eachother
  • Team Work! 
  • Lothar Meyer used atomic weights to arrange 28 elements into 6 families that bore similar chemical and physical characteristics, he discovered the valence, which was the number that represented the combining power of an atom of a particular element, was the link among each family of elements and the pattern at which each family is organized.
  • Dmitri Mendeleev discovered that when all the known chemical elements were arranged in order of increasing atomic weight, the resulting table displayed a recurring pattern, or periodicity, of properties within groups of elements.
  • These three scientists and chemists influenced and started the construction for the periodic table we see today, and more. 
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