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Unit 1 Atomic Theory ((subatomic particles (protons (positive charge,…

- - - - positive charge
      - found in nucleus
      - 1 a.m.u.
    - - 1 a.m.u.
      - neutral = no charge
      - found in nucleus
    - - negative charge
      - found in electron cloud
      - 1/1840 a.m.u.
  - - - Average atomic mass = (%atomic mass) + (%atomic number) a.m.u. = atomic mass unit
  - - - find fossil age
      - nuclear power
      - cancer radiotherapy
- - - - mass can neither be created nor destroyed in a chemical or physical reaction
    - - A given chemical compound will always contains the same proportions of elements by mass.
    - - When 2 elements combine, the mass of one element that combine with another element, will always be ratios of whole numbers.
- - - - Dalton concluded that the cathode rays must have negative charge
  - - - negatively charged particles (electrons) are spread in a positive sphere
- - - - Instead only some particles pass through, some were reflected back
- - - - elements will change their identity
  - - - 2 protons and 2 neutrons
      - 2+ charge
      - don't go through paper
    - - 1 electron
      - 1- charge
      - don't go through aluminium
    - - no mass
      - neutral = 0 charge
      - don't go through concrete
- - - - Atoms are indestructible and indivisible
        
        Atoms cannot be cut into a smaller pieces
      - Atoms have different sizes and shapes depending on the properties of the material.
- - - - the Law of Gravitation
      - Newton's Laws of Motion
  - - - Big Bang theory
      - Cell theory
      - Atomic theory
- - - - Earth
      - Fire
      - Water
      - Air