1.2 Electromagnetic Flashcards
Aufbau Principle
States that electrons will fill orbitals starting with the orbital of the lowest energy-lowest energy levels are filled first
Hund’s Rule
When two electrons occupy degenerate orbitals they do so in such a way as to maximise the number of parallel spins -Electrons do no pair together until they have to
Degenerate means
All the electrons are at the same energy level
Pauli’s exclusion principle
If there are two electrons in an orbital then there spins must be opposite
S orbitals can take
2 electrons
P orbitals can take
6 electrons
D orbitals can take
10 electrons
Principle number (n)
The shell the electron is found in eg, 1,2,3,4…..
Angular momentum (l)
The shape of the orbital the electron is found in eg, S(0),P(1) or D(2)
Magnetic (mL)
The orientation in a space of the atomic orbitals eg, (-1,0,+1)
The Spin (s)
If two electrons are in the same subshell they are spinning in opposite directions eg +1/2 or -1/2
S orbitals have a l value of
0
P orbitals have a l value of
-1,0,+1
D orbitals have a l value of
-2,-1,0,+1,+2
F orbitals have a l value of
-3,-2,-1,0,+1,+2,+3