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F944748C-0409-4EF6-B6BB-714601E5FEFD, 2DC14E8A-09B3-4E1D-AB39-FDC088738D2D…

- - - - positively-charged
        
        Protons
      - neutral-charged
        
        Neutrons
    - - negatively-charged
        
        Electrons
        
        gains electron(s)
        
        Anion
        
        loses electron(s)
        
        Cation
- - - - in 1911
      - by Ernest Rutherford
  - - - in 1913
      - by Neils Bohr
  - - - in 1904
      - by Joseph John Thomson
  - - - by John Dalton
      - in 1803
  - - - by Erwrin Schrodinger
      - in 1926
- - - - Democritus
        
        “Atomos”
        
        Indivisible
        
        “Atom”
      - “Matter is composed of indivisible building blocks.”
  - - - ”All matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass”.
  - - - radioactivity
        
        which demonstrated that
        
        “Atom was neither indivisible nor immutable.”
  - - - electrons
        
        through
        
        Cathode ray tube experiment
  - - - Alpha Particles
        
        positively-charged particles
      - Nucleus
        
        based from
        
        Gold Foil Experiment
  - - - Electrons should move around the nucleus but only in prescribed orbits.
        
        based from
        
        Quantum Theory
  - - - the core also contains a new uncharged particle
        
        Neutron
  - - - “All of those particles, including the neutron and proton, are composed of fundamental building blocks that he named “quarks,” with very unusual properties.
    - - proposed the existence of quarks