Download niels bohr model

Alex Costa
Kaylee Coyle
NIELS BOHR
Background
 Born in Copenhagen, Denmark in 1885
 Interested in physics at a young age
 Earned a doctorate in physics from
Copenhagen university in 1911
Interest in atoms
 Became interested in Max Planck’s quantum
theory while studying the electron theory of
metals
 In 1912 while working for J.J Thompson, Bohr
was introduced to Ernest Rutherford
 Rutherford development of an atomic model
sparked Bohr’s interest in studying the atom
Bohr’s atomic model
 Shows the atom as a small, positively
charged nucleus surrounded by orbiting
electrons
 First model to highlight electrons travel in
separate orbits
 This explained why atoms omitted light in
fixed wavelengths
 Element 107 bohrium (Bh) is named after him
https://www.youtube.com/watch?v=Cn6v5ygy
ZHQ
Bohr’s atomic model
 Suggested atoms can only have classical
motions
 Orbits are associated with definite energy or
energy levels
 Said that electrons can only gain or lose
energy by transferring to an allowed energy
level

E = E2 – E1 = hv
Hydrogen atom Theory
 Energy is transferred only in certain well
defined quantities
 This explained why atoms omitted light in
fixed wavelengths
Liquid Droplet Theory
 A liquid drop provides an accurate
representation of an atom’s nucleus
 Instrumental in attempts to split Uranium
atoms in the 1930’s for development of the
atom bomb
Quantum Theory
 An electron can either be viewed as a particle
or a wave, but never both
 Applied to Rutherford’s atomic structure
saying electrons travel in stationary orbit
References
 http://www.livescience.com/32016-niels-
bohr-atomic-theory.html
 http://en.wikipedia.org/wiki/Bohr_model