Please enable JavaScript.

Coggle requires JavaScript to display documents.

ATOM - Coggle Diagram

- - - - protons + neutrons = mass number
        
        NEUTRONS
        
        MASS OF 1 UNIT
        
        NO CHARGE
        
        PROTONS
        
        MASS OF 1 UNIT
        
        POSITIVELY CHARGE "+"
    - - and revolves in orbits
        
        which are outside the nucleus
      - NEGATIVELY CHARGE "-"
      - has negligible mass
- - - - Leucippus
      - Democritus
        
        Democritus proposed that different types and combinations of these particles were responsible for the various forms of matter.
        
        However, these ideas were largely ignored at the time, as most philosophers favored the Aristotelian perspective.
      - The Greeks called these particles atomos, meaning indivisible, and the modern word “atom” is derived from this term.
  - - - JOHN DALTON
        
        Dalton drew upon the Ancient Greek idea of atoms 'atomos' meaning indivisible.
        
        His theory stated that atoms are indivisible, those of a given element are identical, and compounds are combinations of different types of atoms.
      - PLUM PUDDING MODEL 1904
        
        J.J. THOMSON
        
        Thomson discovered electrons 'corpuscles' in atoms in 1897, for which he won a Nobel Prize.
        
        He subsequently produced the 'Plum Pudding' model of the atom.
        
        1 more item...
        
        NUCLEAR MODEL 1911
        
        ERNEST RUTHERFORD
        
        Rutherford fired positively charged alpha particles at a thin sheet of gold foil.
        
        1 more item...
        
        PLANETARY MODEL 1913
        
        NIELS BOHR
        
        1 more item...
        
        QUANTUM MODEL 1926
        
        ERWIN SCHRODINGER
        
        1 more item...