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Atoms

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on 5 June 2015

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Transcript of Atoms

4 Elements
Democritus
Atoms have charge!
Static electricity
-Negative
+Positive

Ions - atoms with a positive or negative charge

Repel - to push away (positive & positive)
"Attract" - to come together

Evidence:
Balloon and hair



+ Positive Center +
Claim : Rutherford - Positive charge


Atoms
Empedocles - Greek philosopher
Claim : Everything made up of 4 elements
Earth, Water, Air, Fire

Claim: Atoms Exist
Reasoning
Evidence
Baking soda, vinegar, and fire experiment

Reasoning
Vinegar - Water
Air - Smell
Baking soda - Earth, Air
Candle - Water, Fire
Earth and Air are under fire
Trapped Air - bubbles rise up
"Cut an iron rod in half..again...and...again"
Not proven, but there was common sense
Break it in half, you have the other half



Ex:
One side gets heated faster due to atoms, no atoms equals all fire
Claim: Electrons (negative charges) move in defined spaces in an atom
Evidence : Gold foil experiment
Reasoning :
Noticed some where bouncing off
+ , + Repel
- , + Attract
Reasoning
Salt and fire experiment
Evidence
Niel Bohr

More energy the farther the electron is pushed, which means faster return to the center; Easier to be close than far apart
Once close to the atoms center, energy the electron has is turned into visible light (color)
Color has specific frequency and energy; Higher frequency is more energy; Depends on how far the electron jumps back down after it has been heated
Keep color the same by having the electrons go back and forth in specific shells
Claim: An atom also contains neutrons. Not positive, not negative.
Evidence
Reasoning
Neutrons Exist
Same atom
Same amount of protons and electrons
Different weights
Protons add mass to atom
Full transcript