THE ATOM Flashcards
1
Q
Dalton’s Atomic Theory:
A
All matter is made up of indivisible atoms which cannot be created or destroyed.
2
Q
William Crookes
A
discovered the Electron. Cathode ray tube.
3
Q
JJ Thomson
A
determined that electrons were negative. Found E/M ratio.
4
Q
Robert Millikan’s
A
Oil drop experiment discovered size of electron’s charge.
5
Q
Plum Pudding Model:
A
Solid positive sphere with electrons embedded.
6
Q
Rutherford
A
discovered the Nucleus. Fired alpha particles at gold foil. Proton.
7
Q
Energy level
A
is the fixed energy value that an electron in an atom may have.
8
Q
Heisenberg’s Uncertainty Principle
A
states that it is impossible to measure at the same time both the velocity and the position of an electron.
9
Q
Orbital
A
is a region of space in which there is a high probability of finding an electron.
