Physics 4 - Atomic Structure Flashcards
1
Q
What were atoms thought to be before the discovery of the electron? Who?
A
Tiny spheres that could not be divided
John Dalton
2
Q
What led to the plum pudding model? What did the PPM suggest? Who?
A
Discovery of the electron led to plum pudding model:
- JJ. Thompson suggested that the atom is a ball of positive charge with negative electrons embedded in it
3
Q
Alpha scattering experiment….Who?
A
Rutherford
- fired a beam of alpha particles at thing gold foil
- from PPM, expected particles to pass straight through gold sheet or be deflected slightly
- although most went straight thought, some were deflected more than expected (some came back the way they had come)
- PPM did not explain this
