Download Chemistry Timeline

Atomic Theory and the Periodic Table Timeline
Create a timeline showing the advances in the understanding of the atom and the arrangement of the periodic table. You
must match the following people on the left to the list of the particular contribution on the right:
WHO
WHAT
 Aristotle
 Arranged the elements by atomic number
 Jons (John) Berzelius
 Arranged the elements by mass and similar properties
 Neils Bohr
 Arranged the elements in Octaves
 James Chadwick
 Arranged the elements in Triads
 Marie Curie
 Developed the current symbols used for the elements
 John Dalton
 Developed a model of the atom where electrons are in
rings
 Democritus
 Developed the Law of Conservation of Mass, and
 Johann Döbereiner
named many elements
 Antoine Lavoisier

Discovered the electron and created the “plum pudding
 Dmitri Mendeléeff (or Mendelev or Mendeleev)
model”
 Henry Moseley

Discovered the neutron
 John Newlands

Discovered the nucleus and proton
 Ernest Rutherford

Discovered Nuclear Radiation (and Radium and
 Joseph John Thomson
Polonium)
 Four elements
 Invented a good atomic theory (list all points)
 Matter is made up of “atomos”
For each person include in a TYPED paragraph:
1. The name of the scientist with birth and death dates (as known). In other words, WHEN.
2. A complete explanation of their contribution to the understanding of atoms and the periodic table. In other
words, state WHO did WHAT from the list above. (This should be one sentences long)
3. An explanation of how the scientist figured out their contribution. If they performed an experiment, then how
did it work? If they did not perform an experiment, what did they do to come to their discovery? In other
words, tell me HOW or WHY they did WHAT they did. (This should be one to three sentences long.)
4. Make a drawing by hand and in color (black will not count) to represent how their contribution changed
chemistry’s view of atoms and the periodic table. (Not a picture of the person – a picture of what they
contributed.)
The timeline should be one-sided with your name on the back. The paragraphs should be in your own words, and your
words should not match anyone else’s words. Credit will be lost for matching information. The paragraphs will be cut
out and glued to the timeline (poster board provided). This project will be taken for a DOUBLE MAJOR GRADE, and
you will have ONLY 5 days in class to work on it. This paper should be stapled to your timeline.
Scientist
Aristotle
Jons (John) Berzelius
Neils Bohr
James Chadwick
Marie Curie
John Dalton
Democritus
Johann Döbereiner
Antoine Lavoisier
Dmitri Mendeléeff
Henry Moseley
John Newlands
Ernest Rutherford
Joseph John Thomson
Timeline Check-list
WHEN
WHAT
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2 points per box
HOW/WHY
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Drawing
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