Bohr Theory of Atom - Physical Chemistry - Lecture Notes, Study notes of Physical Chemistry

Download Bohr Theory of Atom - Physical Chemistry - Lecture Notes and more Study notes Physical Chemistry in PDF only on Docsity! The Bohr Theory of the Atom an attempt to use some classical and some quantum arguments to develop equations which explained line spectra of hydrogen atom Postulates: • electrons exist in stationary states at particular energy values • jumping from state to state releases energy or absorbs energy • photon is absorbed or emitted • energy values derive from quantization of angular momentum (n is quantum integer) vr 2 h m n π = =h h note this also comes from constructive interference of DeBroglie waves (h/mv=λ) Docsity.com Now one can derive the equations describing transitions between levels: o e A πε4 2 = define a constant from electrostatics -282.30708 x 10 JA m= ⋅ r m r Z A 2 2 v = coulombic = centripetal force r AZ m 2 v 2 1 2 = kinetic energy r AZ V −= potential energy r AZ E 2 −= total energy So this gives us the energy of the levels as a function of r, the distance between the nucleus and the electron. Docsity.com