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Atoms and The Periodic Table

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Why did Democritus call his fundamental particle of. matter the 'atom? ... Used cathode with paddle wheel: What did he conclude? JJ Thomson ... – PowerPoint PPT presentation

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Title: Atoms and The Periodic Table


1
Atoms andThe Periodic Table
KD McMahon Reseda Science Magnet
2
Aristotleand Democritus
Aristotle
Essence/Form
Potential --gt Actual
Four Elements
3
Aristotleand Democritus
Democritus
a tome not cut
makes up everything
many different kinds
exist forever
only matter
4
John Dalton
Atoms of same element are identical
atoms combine --gt whole ratios --gt
compounds
chem Rxs atoms separate recombine
no transmutation
5
Review 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?
6
JJ Thomson
Used cathode ray tubes
7
JJ Thomson
Used cathode with paddle wheel
What did he conclude?
8
JJ Thomson
Used cathode with oppositely charged plates
9
JJ Thomson
Used cathode with oppositely charged plates
10
JJ Thomson
Used cathode with oppositely charged plates
What did he conclude?
11
JJ Thomson
From these results he came up with
The Plum Pudding Model of the Atom
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