Slide 1

Hog Hilton Rules
1. Hogs are lazy. (They don’t like to
climb stairs if they don’t have to.)
2. Hogs can’t stand each other each
other except when rule #1 forces
them to be together.
3. If hogs are in the same room they
will face in opposite directions.
4. They stink so you can’t put more
than 2 hogs in the same room.

Electron Configuration
Rules
1. Electrons are lazy. (Aufbau Principle)
2. Electrons don’t like to be together
unless they have to. (Hund’s Rule)
3. If electrons are in the same orbital,
they spin in opposite directions.
(Pauli Exclusion Principle)
4. Only 2 electrons can fit in each
orbital. (Pauli Exclusion Principle)

Electron Configuration…
 General format:

n l e-

n = quantum number (energy level)

l = subshell (sublevel) letter
e- = number of electrons
 Fill the lowest energy levels first.
in this order: 1s 2s 2p 3s 3p 4s 3d 4p
 No more than 2 electrons per orbital.
reminders:
 2es = 1 orbital
p = 3 orbitals  6ed = 5 orbitals  10ef = 7 orbitals  14e-

 examples:
 H:
Add up all the
1s1
electron #s and it
should equal the total
 He:
number of electrons
2
1s
in the element.
 Li:
1s2 2s1
Co:
1s2 2s2 2p6 3s2 3p6 4s2 3d7

Condensed Electron Configuration
distinguishes the inner electrons from the
valence electrons.
Valence electrons are the outer most
electrons and are involved in chemical
reactions.
BIG HINT: The
 Examples:
condensed electron
 Li:
configuration is on your
[He] 2s1
Periodic Table
 Co:
[Ar] 4s2 3d7


Slide 2

Hog Hilton Rules
1. Hogs are lazy. (They don’t like to
climb stairs if they don’t have to.)
2. Hogs can’t stand each other each
other except when rule #1 forces
them to be together.
3. If hogs are in the same room they
will face in opposite directions.
4. They stink so you can’t put more
than 2 hogs in the same room.

Electron Configuration
Rules
1. Electrons are lazy. (Aufbau Principle)
2. Electrons don’t like to be together
unless they have to. (Hund’s Rule)
3. If electrons are in the same orbital,
they spin in opposite directions.
(Pauli Exclusion Principle)
4. Only 2 electrons can fit in each
orbital. (Pauli Exclusion Principle)

Electron Configuration…
 General format:

n l e-

n = quantum number (energy level)

l = subshell (sublevel) letter
e- = number of electrons
 Fill the lowest energy levels first.
in this order: 1s 2s 2p 3s 3p 4s 3d 4p
 No more than 2 electrons per orbital.
reminders:
 2es = 1 orbital
p = 3 orbitals  6ed = 5 orbitals  10ef = 7 orbitals  14e-

 examples:
 H:
Add up all the
1s1
electron #s and it
should equal the total
 He:
number of electrons
2
1s
in the element.
 Li:
1s2 2s1
Co:
1s2 2s2 2p6 3s2 3p6 4s2 3d7

Condensed Electron Configuration
distinguishes the inner electrons from the
valence electrons.
Valence electrons are the outer most
electrons and are involved in chemical
reactions.
BIG HINT: The
 Examples:
condensed electron
 Li:
configuration is on your
[He] 2s1
Periodic Table
 Co:
[Ar] 4s2 3d7


Slide 3

Hog Hilton Rules
1. Hogs are lazy. (They don’t like to
climb stairs if they don’t have to.)
2. Hogs can’t stand each other each
other except when rule #1 forces
them to be together.
3. If hogs are in the same room they
will face in opposite directions.
4. They stink so you can’t put more
than 2 hogs in the same room.

Electron Configuration
Rules
1. Electrons are lazy. (Aufbau Principle)
2. Electrons don’t like to be together
unless they have to. (Hund’s Rule)
3. If electrons are in the same orbital,
they spin in opposite directions.
(Pauli Exclusion Principle)
4. Only 2 electrons can fit in each
orbital. (Pauli Exclusion Principle)

Electron Configuration…
 General format:

n l e-

n = quantum number (energy level)

l = subshell (sublevel) letter
e- = number of electrons
 Fill the lowest energy levels first.
in this order: 1s 2s 2p 3s 3p 4s 3d 4p
 No more than 2 electrons per orbital.
reminders:
 2es = 1 orbital
p = 3 orbitals  6ed = 5 orbitals  10ef = 7 orbitals  14e-

 examples:
 H:
Add up all the
1s1
electron #s and it
should equal the total
 He:
number of electrons
2
1s
in the element.
 Li:
1s2 2s1
Co:
1s2 2s2 2p6 3s2 3p6 4s2 3d7

Condensed Electron Configuration
distinguishes the inner electrons from the
valence electrons.
Valence electrons are the outer most
electrons and are involved in chemical
reactions.
BIG HINT: The
 Examples:
condensed electron
 Li:
configuration is on your
[He] 2s1
Periodic Table
 Co:
[Ar] 4s2 3d7


Slide 4

Hog Hilton Rules
1. Hogs are lazy. (They don’t like to
climb stairs if they don’t have to.)
2. Hogs can’t stand each other each
other except when rule #1 forces
them to be together.
3. If hogs are in the same room they
will face in opposite directions.
4. They stink so you can’t put more
than 2 hogs in the same room.

Electron Configuration
Rules
1. Electrons are lazy. (Aufbau Principle)
2. Electrons don’t like to be together
unless they have to. (Hund’s Rule)
3. If electrons are in the same orbital,
they spin in opposite directions.
(Pauli Exclusion Principle)
4. Only 2 electrons can fit in each
orbital. (Pauli Exclusion Principle)

Electron Configuration…
 General format:

n l e-

n = quantum number (energy level)

l = subshell (sublevel) letter
e- = number of electrons
 Fill the lowest energy levels first.
in this order: 1s 2s 2p 3s 3p 4s 3d 4p
 No more than 2 electrons per orbital.
reminders:
 2es = 1 orbital
p = 3 orbitals  6ed = 5 orbitals  10ef = 7 orbitals  14e-

 examples:
 H:
Add up all the
1s1
electron #s and it
should equal the total
 He:
number of electrons
2
1s
in the element.
 Li:
1s2 2s1
Co:
1s2 2s2 2p6 3s2 3p6 4s2 3d7

Condensed Electron Configuration
distinguishes the inner electrons from the
valence electrons.
Valence electrons are the outer most
electrons and are involved in chemical
reactions.
BIG HINT: The
 Examples:
condensed electron
 Li:
configuration is on your
[He] 2s1
Periodic Table
 Co:
[Ar] 4s2 3d7


Slide 5

Hog Hilton Rules
1. Hogs are lazy. (They don’t like to
climb stairs if they don’t have to.)
2. Hogs can’t stand each other each
other except when rule #1 forces
them to be together.
3. If hogs are in the same room they
will face in opposite directions.
4. They stink so you can’t put more
than 2 hogs in the same room.

Electron Configuration
Rules
1. Electrons are lazy. (Aufbau Principle)
2. Electrons don’t like to be together
unless they have to. (Hund’s Rule)
3. If electrons are in the same orbital,
they spin in opposite directions.
(Pauli Exclusion Principle)
4. Only 2 electrons can fit in each
orbital. (Pauli Exclusion Principle)

Electron Configuration…
 General format:

n l e-

n = quantum number (energy level)

l = subshell (sublevel) letter
e- = number of electrons
 Fill the lowest energy levels first.
in this order: 1s 2s 2p 3s 3p 4s 3d 4p
 No more than 2 electrons per orbital.
reminders:
 2es = 1 orbital
p = 3 orbitals  6ed = 5 orbitals  10ef = 7 orbitals  14e-

 examples:
 H:
Add up all the
1s1
electron #s and it
should equal the total
 He:
number of electrons
2
1s
in the element.
 Li:
1s2 2s1
Co:
1s2 2s2 2p6 3s2 3p6 4s2 3d7

Condensed Electron Configuration
distinguishes the inner electrons from the
valence electrons.
Valence electrons are the outer most
electrons and are involved in chemical
reactions.
BIG HINT: The
 Examples:
condensed electron
 Li:
configuration is on your
[He] 2s1
Periodic Table
 Co:
[Ar] 4s2 3d7