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Atoms and The Periodic Table. KD McMahon Reseda Science Magnet. Aristotle and Democritus. Aristotle:. • Essence/Form. • Potential --> Actual. • Four Elements. Aristotle and Democritus. Democritus. • a’ tome = not cut. • makes up everything. • many different kinds.

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Presentation Transcript
atoms and the periodic table
Atoms andThe Periodic Table

KD McMahon

Reseda Science Magnet

aristotle and democritus
Aristotleand Democritus

Aristotle:

• Essence/Form

• Potential --> Actual

• Four Elements

aristotle and democritus1
Aristotleand Democritus

Democritus

• a’ tome = not cut

• makes up everything

• many different kinds

• exist forever

• only matter

john dalton
John Dalton

• Atoms of same element

are identical

• atoms combine --> whole #

ratios --> compounds

• chem Rx’s: atoms

separate & recombine

• no transmutation

review questions
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 Dalton’s 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?

jj thomson
JJ Thomson

Used cathode ray tubes

jj thomson1
JJ Thomson

Used cathode with paddle wheel:

What did he conclude?

jj thomson2
JJ Thomson

Used cathode with oppositely charged plates:

jj thomson3
JJ Thomson

Used cathode with oppositely charged plates:

jj thomson4
JJ Thomson

Used cathode with oppositely charged plates:

What did he conclude?

jj thomson5
JJ Thomson

From these results he came up with:

The Plum Pudding Model

of the Atom