Atom Flashcards
1
Q
JJ Thomson
A
Electrons are negative (plates)
2
Q
Dalton theory about atoms
A
All matter is made up of Atoms are indivisible and cannot be created or destroyed
3
Q
William Crookes
A
Electrons cathode rays (paddle wheel)
4
Q
Plum pudding model
A
A dense positive sphere with electrons embedded
5
Q
Ernest Rutherford
A
Discovered nucleus Gold foil and protons (many,some,very few)
6
Q
James Chadwick
A
Discovered the neutron (fired alpha at beryllium + paraffin wax block)
7
Q
Energy level
A
The fixed energy value that an electron in a atom may have
8
Q
Heisenberg Uncertainty Principle
A
It’s impossible to measure both the velocity and position of an electron in an atom
9
Q
Orbital
A
A region in space where there’s a high probability of finding an electron
