physical science Flashcards
existence of atoms
Democritus
electrons
J.J. Thomson
nucleus/empty space
Ernest Rutherford
Electron are in levels
Neils Bohr
electrons are in orbitals
Werner Heisenberg
Plum pudding model
Thomson
Rutherford model
Energy levels
Bohr
Quantum Mechanical Model
Heisenberg
proton
+
neutron
0
electron
-
nucleus
+
entire atom
0
Which characteristic of Bohr’s model of the atom is no longer accepted by the scientific community?
Electrons exist in definite energy levels
Then, what is the purpose of using Bohr’s model of the atom?
Electrons orbit the nucleus and the atoms does not collapse in on itself
1st energy level: e
2
2nd energy level
8
3rd energy level
18
4th energy level
32
Describe the “path”/location of the electron in comparison to the nucleus of an atom.
orbit around the nucleus
When electrons jump from one energy level to another energy level, this is called:
tunneling
When electrons move____ the nucleus they gain energy.
Away
When electrons move____the nucleus they lose energy.
towards
Explain how atoms are able to give off light.
When they get excited they jump energy levels, but they only stay
s orbital
sphere
p orbital
dumbbell
d orbital
2 dumbbells
Each individual orbital can hold a maximum of electrons
2
