Bohr Models and Diagrams

Bohr (1920)

1. Protons and electrons attract each other, so that Rutherford’s models are unstable. When matter is heated, it will emit light.
2. .Light travels as photons (wavelength)
3.  Each atom has different spectra of light

Bohr based his model on the emission of light. To explain this, he presumed some theory:

1. Electron exist in orbital or shells
2.  Because matter is unstable. When they absorb energy, they move to a higher orbital. When they release energy, they move to a lower orbital.

Protons=11    Atomic Mass= 23.0  

Neutrons=23-11=12      (one valence electron) - so sodium always form an ion with 1+ charge

- Two different models can be used to describe electron configuration:

1. Energy Level Model

2. Bohr Model

-Here are some rules about how electrons occupy shells:

1. 2 e- in the first orbital
2.  8 e- in the second orbital
3.  8 e- in the third orbital

-the electrons were absorbing and then emitting energy from different energy levels around the atoms and proposed his model of the atom

http://www.youtube.com/watch?v=-YYBCNQnYNM&feature=related