Atom Models Flashcards
1
Q
What is the plum pudding model?
A
A positively charged sphere with negative corpuscles (electrons)
2
Q
What was the Gieger-Marsden experiment?
A
They fired positively charged alpha particles at a thin sheet of gold
3
Q
What did the experiment prove?
A
The existence of a tiny positive nucleus surrounded by a cloud of electrons; and that most of them atom is empty space
4
Q
Who discovered the neutron?
A
James Chadwick
5
Q
What did Niel Bohr propose?
A
1) Electrons only exist in fixed orbits (shells)
2) Each shell has a fixed energy
3) When an electron moves between shells, electromagnetic radiation is emitted or absorbed
4) As the energy of shells is fixed, the radiation will have a fixed frequency
6
Q
What did JJ Thomson discover?
A
That atoms weren’t solid or indivisible
