Transcript Atomic Theory Timeline

Atomic
Theory
Timeline
Ernest Rutherford
Werner Heisenberg
J.J. Thomson
Neils Bohr
Aristotle
1910 AD
1897 AD
300 BC
400 BC
James Chadwick
1913 AD
1803 AD
Democritus
of Adbera
1900 AD
1911 AD
1925 AD
1932 AD
1930 AD
1924 AD
Louis de Broglie
Max Planck
John Dalton
Robert Millikan
Erwin Schrodinger
Performed the gold foil experiment
Atoms have a small, positively charged nucleus
surrounded by empty space
Predicted the existence of neutrons
Atomic
Theory
Timeline
Developed the “Uncertainty Principle”
Impossible to determine the position
and momentum of a particle at the
same time.
Ernest Rutherford
Only 4 elements: earth, fire, air,
water
Dismissed idea of the atom as
“worthless”
Werner Heisenberg
Electrons orbit the nucleus
Electrons travel in specified
energy levels and produce
spectrum as they move
Discovered the electron
Described the nature of cathode
rays
J.J. Thomson
Neils Bohr
Aristotle
Discovered the
neutron.
Worked with
Rutherford on the
Nuclear Model.
James Chadwick
1913 AD
1910 AD
1897 AD
300 BC
400 BC
1900 AD
1803 AD
Democritus
of Adbera
1911 AD
1932 AD
1930 AD
1924 AD
Louis de Broglie
Max Planck
Atomos = indivisible
First to describe possibility of
atoms
Atoms are solid, infinite, and the
smallest pieces of matter
1925 AD
Atoms can emit quanta
(quantum waves)
Electrons similar to waves and
particles
A group of waves was named
after him
John Dalton
Father of modern atomic theory
Elements are composed of
atoms
An Element’s atoms are
identical in mass
Robert Millikan
Measured the charge of an
electron
Performed the oil drop
experiment
Completed experiments with
Thomson
Erwin Schrodinger
Showed mathematically that
waves can be used to describe
electrons in atoms
Determined the most probable
location of electrons in atoms