History of the atom Flashcards
Who made the first model of an atom?
John Dalton
John Dalton said atoms cannot be…
Created or destroyed
John Dalton said atoms in an element are?
Identical
JJ Thomson made what?
The plum pudding model
The plum pudding model was
A sphere of positive charge with negatively charged electrons spreading through it.
What did Ernest Rutherford do?
Proved the plum pudding model was wrong
How did Ernest Rutherford prove the plum pudding model was wrong?
He fired alpha particles at a piece of gold foil
If the plum pudding model was correct what would have happened?
The alpha particles should have bounced off of the atoms
What actually happened when Ernest Rutherford carried out the plum pudding experiment.
Most particles went straight through the atom however some bounced off of a bit in the centre.
What did Neils Bohr do?
He figured out that Electrons orbit the Nucleus at a specific distance. We now call this electron shells.
What did James Chadwick do?
Discovered Neutrons
