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Periodic table History (330 bc (1817 (1864 (1869 (1897 (John Dalton's…

- - - - Lothar meyer developed the early version of the periodic table with 28 elements.
      - 1869
        
        Dimitri Mendeleev created his own periodic table
        
        1897
        
        Ernest Rutherford became the father of nuclear physics after finding Atoms have a small charge nucleus surrounded by large, empty spaces,and are circled by tiny electrons, which became known as the Rutherford model (or planetary model) of the atom.
        
        John Dalton's atomic theory
        
        every thing is made of atoms and are indestucible
        
        every atom of an element are the same
        
        compounds are made of 2 or more different kinds of atoms
        
        chemical reactions are rearrangements of atoms
        
        JJ Thompson discovered electrons
- - - - 38 molecular mass
        
        -220˙c
        
        -188˙c
    - - 71 molecular mass
        
        -101˙c
        
        -34˙c
    - - 160 molecular mass
        
        -7˙c
        
        59˙c
    - - 254 molecular mass
        
        114˙c
        
        184˙c
    - - 420 molecular mass
        
        302˙c?
        
        337˙c?
  - - - Group 0 on the right side of the periodic table are called noble gases.
        
        Noble gases have low melting and boiling points, so they all form gases at room temperature. They all very unreative. Noble gases were actually called "Inter gases", as it thought that they didn't react with anything. In 1962, British chemist Neil Bartlett made a compound with xenon. The name was changed to "Noble gases" as they were considered similar to very unresctive precious metals (e.g gold), which are sometimes called "noble" metals. Noble gases are very stable and the most unreactive (or inter) of all the elements. All of the noble gases are similarly unreactive.
        
        They do not formally form bonds with othere elements. They are monatomic, wich means they exist as individual atoms. Most other gases are diatomic.