Name:

Atomic Model Notes Fill-in

1803 - _________________ particles

  1. Atoms = small _________________ , _________________ particles.
  2. Atoms of an _________________ are _________________.
  3. Atoms of _________________ elements are _________________.
  4. Atoms do not change their identity during _________________   _________________.

1897 - _________________ Plum Pudding

  1. Atom is made of _________________   _________________ !
  2. Atom is uniform sphere with _________________ scattered throughout.

1897 - _________________ Radioactivity

  1. Becquerel and the Curies (France).
  2. Radioactivity : _________________ spontaneously emitted by _________________.
  3. _________________ (1899) discovers _________________ and _________________ particles.

1910 - _________________ Nucleus

  1. Observations by Rutherford's (and Geiger) experiment with _________________-particle, gold foil target and ZnS screen.
  2. Inference: _________   _________________ charge concentrated in a small, dense _________________.

1913 - _________________ Model

  1. _________________ exist in discrete _________________ _________________.
  2. Energy states represented as levels around nucleus.
    1. First _________________ can contain _________________
    2. Second, third and fourth levels can contain eight _________________
    3. _________________ levels are filled before _________________ levels.
    4. Levels can hold fewer than the _________________ e-.
    5. More _________________ model has sub-levels in each level. Identified with letters: s, p, d, f
  3. e- can _________________ or _________________ energy and change their _________________.
  4. Hydrogen Bohr radius = 5.29 x 10-11 m.

1926 - Quantum-Mechanic Model

  1. Work of Einstein and others showed that _________________ is the same as _________________.
  2. Both can behave as particles and waves. Described with complex mathematics.
  3. e- described as moving in the _________________ _________________.
  4. Quantum numbers describe the atom's _________________ state: size, shape and orientation of e- field.