Bohr's Model

The Bohr model: was introduced my Neils Bohr in 1913. He introduced that surronding the positively charged nucleus was electrons. His idea is somewhat similar to the solar system with the exception that electrostatic forces provide attraction not gravity. At some point Bohr and Rutherford's models were "combined" since Bohr's model is like a quantum physics based modification of Rutherford's model; people called it the "Bohr-Rutherford model. "

-Rutherford's model was inherently unstable

• Protons and Electrons should attract eachother

-Matter emits light when it is heated (backbody radiation)

•   Light travels as a photon

 . Energy photons carry depends on their wavelength
   e.g: radio stations such as the beat 94.5 <---- the 94.5 actually represents frequency radio waves
         (FM has more energy than AM)

These lines in the emission spectrum are unique set of lines for each element. Each line represents a Photon of light emitted from the excited atom. Bohr based his model on the energy (light) emitted by different atoms. Each atom has a specific spectra of light. To explain this emission spectra, he suggested that electrons occupy Shells or Orbitals

Bohr's Theory

- Electrons exist in orbits
- when they absorb energy they move to a higher orbital
- As they fall from a higher orbital to a lower one they release energy as a photon of light.


Here is an educational video that explains a bit more about Bohr's theory. :)