S- orbitals (l=0)

p- orbital (l=1)

d-orbital (l=2)

Energy Level diagrams

Electronic Configuration

Pauli exclusion principle – no two electrons in an atom can have the same four quantum numbers.

Electronic Configuration

Pauli exclusion principle – no two electrons in an atom can have the same four quantum numbers.

Shielding may cause some orbitals to over lap.

Electronic Configuration Pauli exclusion principle – no two

electrons in an atom can have the same four quantum numbers.

Shielding may cause some orbitals to over lap.

Hunds rule – the most stable arrangement of electrons in subshells is the one with greatest number of parallel spins

) ) ) ) )1 2 3 4 5

) ) ) ) )1 2 3 4 5

2e- 8e- 18e- 32e-

Number of electrons in Orbitals

s = 2 e-

p = 6 e-

d = 10 e-

f = 14 e-

)) )

)) )

) )N

Na

Si

7e-

11e-

14e-

2e-

8e- 1e-

4e-

2e-

2e-

5e-

8e-

1 2 3