Looking into Atoms Flashcards
What did Dalton imagine the Atom to be?
A billiard ball
When were answers found about the Atom?
1904
What did J.J Thomson ask?
What are the rays made of?
What did Thomson think about rays think?
The rays are electrically charged.
What are negative rays made up of?
Particles, he called these particles Electrons, every electron has the same negative charge and tiny mass.
Where do electrons come from?
Well because everything is made up of atoms, electrons must be in atoms.
When did Thomson suggest a new Atomic model?
1904
What did Thomson say about the Atoms?
He said that an atom has negative electrons moving around in a positively charged sphere.
What did people call Thomson’s model?
The Plum-Pudding model.
Who is Ernest Rutherford?
He is a scientist who doubted the Plum-pudding model.
Who made the gold foil experiment?
Rutherford, Geiger and Marsden.
What was the Gold foil experiment?
The gold foil experiment was made by playing a very thin sheet of gold foil in a florescent screen. 5 positively charged particles were shot at it.
What was the prediction for the gold foil experiment?
That most would go through the foil and hit the screen. And the others would change direction slightly.
What actually happened in the gold foil experiment.
Some particles bounced back off the foil. How could he explain these results?
When did Rutherford come up with his model?
1911.
