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Chemistry
Timeline Instructions
History of the Atom:
Time Line
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Using a search engine on the internet look up each of the scientists on the list below and determine
which of the discoveries they should be credited with in the development of the modern atomic theory.
Create a table with three columns (date, scientist, and discovery) fill in the dates chronologically from
oldest to newest. List the scientist and their discovery next to the appropriate date. Do not just put the
letter of the discovery, write it out.
These will become a part of your notes, so do a good job. Please do this in pencil in case you made any
errors so you will be able to correct them.
Scientists:
1911 Lord Earnest Rutherford
400 BC Democritus
1909 Robert Millikan
1897 G Johnstone Stoney
1897 JJ Thomsen
(approx.)1927-1932 Heisenberg
1932 James Chadwick
1808 John Dalton
1900 Max Planck
1930 Schrodinger
Pre 400 BC Greek Philosphers
1913 Henry Moseley
400 BC Aristotle
1913 Nils Bohr
1810 Amadeo Avagadro
1907 Marie Curie
1927 Irene Joliet-Curie
1869 Dmitri Mendeleev
1906 Hans Geiger
1942 Enrico Fermi
Discoveries:
A. Discovered the charge of an electron by the oil drop experiment
B. Isolated polonium, discovered radioactivity, and Nobel Prize winner.
C. Measured the magnitude of the positive charge of the nucleus
D. Planetary model of the atom
E. First to bombard Be with Alpha particles (Daughter of Marie and Pierre)
F. Coined the word ”atomos” meaning atom
G. Uncertainty principle
H. Named neutrons and also bombarded Be with Alpha particles.
I. Discovered the atom’s nucleus by shooting Alpha particles into gold foil.
J. First to theorize that atoms are small indivisible particles.
K. Used the cathode ray tube to ID negative particles which led to the plum pudding model of the
atom.
L. Theorized that all matter is continuous and not made of particles.
M. Stated that equal volumes of different gases have equal numbers of molecules.
N. Named the electron after its discovery by Thomas.
O. Quaker school teacher that designed the atomic theory.
P. Arranged elements into 7 groups with similar properties. He discovered that the properties of
elements “were periodic functions of their atomic weights/masses”.
Q. Used the idea of quanta (discrete units of energy) to explain hot glowing matter.
R. Viewed electrons as continuous clouds and introduced “wave mechanics” as a mathematical
model of the atom.
S. Developed and electrical device to “click” when hit with alpha particles
T. Conducted the first controlled chain reaction releasing energy from the atoms nucleus.