- Principles of Chemistry I: Honors
Fall 2015, Unique 49310
Lecture Summary, 22 September 2015
Model of the Atom: In 1913, Bohr attempted to
define a model to explain the stable atom. He started with
two assumptions: 1) an electron orbits around a positively charged
nucleus according to Rutherford's planetary model, and 2) the
angular momentum of the orbiting electron is quantized. From
these two postulates, he derived an expression for the energy of a
one-electron atom based only on constants and the "quantum number"
n. The derivation
of this expression is given here:
The Bohr model was able to explain the ionization energies and observed emission spectra of one-electron atoms.