Title: Atoms and The Periodic Table
1Atoms andThe Periodic Table
KD McMahon Reseda Science Magnet
2Aristotleand Democritus
Aristotle
Essence/Form
Potential --gt Actual
Four Elements
3Aristotleand Democritus
Democritus
a tome not cut
makes up everything
many different kinds
exist forever
only matter
4John Dalton
Atoms of same element are identical
atoms combine --gt whole ratios --gt
compounds
chem Rxs atoms separate recombine
no transmutation
5Review Questions
- Why did Democritus call his fundamental particle
of - matter the atom?
2. Why was Democritus theory rejected for so
many centuries?
3. Based on Daltons atomic theory what would be
wrong with the following formula for water
HO1/2
4. According to Dalton would it have been
possible for alchemists to have turned lead
into gold?
6JJ Thomson
Used cathode ray tubes
7JJ Thomson
Used cathode with paddle wheel
What did he conclude?
8JJ Thomson
Used cathode with oppositely charged plates
9JJ Thomson
Used cathode with oppositely charged plates
10JJ Thomson
Used cathode with oppositely charged plates
What did he conclude?
11JJ Thomson
From these results he came up with
The Plum Pudding Model of the Atom