Orbital Notation

1. Orbital NotationOrbital Notation
Props to Mr. Smyk who gave me Props to Mr. Smyk who gave me
this ppt.this ppt.

2. What is Orbital NotationWhat is Orbital Notation
Orbital notation is a visual transformation Orbital notation is a visual transformation
of the electron configuration.of the electron configuration.
Orbital notation shows you where each Orbital notation shows you where each
specific electron is placed (in order) and specific electron is placed (in order) and
what it’s “spin” is.what it’s “spin” is.

3. Vocabulary List CheckVocabulary List Check
Pauli Exclusion Principle:Pauli Exclusion Principle:
No two electrons in the same atom can have
the same spin quantum number. If one
electron has the value of +½ then the other
electron must have the value of −½.
In Orbital notation this means the arrows
representing the electrons must face
opposite direction (+ is up, - is down).

4. Vocabulary List CheckVocabulary List Check
Aufbau principle: (you already know Aufbau principle: (you already know
the concept)the concept)
Aufbau is the German word for “building
up.”
The principle states that electrons fill
orbitals that have the lowest energy first.
You fill electrons in a certain order.
11s s < 2< 2s s < 2< 2p p < 3< 3s s < 3< 3p < 4s < 3d < 4p < 5s < p < 4s < 3d < 4p < 5s <
4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d < 4d < 5p < 6s < 4f < 5d < 6p < 7s < 5f < 6d <
7p 7p

5. Vocabulary List CheckVocabulary List Check
Hund’s Rule:Hund’s Rule:
The rule that states that for an atom in the
ground state, the number of unpaired
electrons is the maximum possible and these
unpaired electrons have the same spin.
What?
You must share your electrons. “Everybody
gets one before anyone gets two.”

6. Meet your next reference sheetMeet your next reference sheet
The orbital notation The orbital notation
reference sheet.reference sheet.
This shows each This shows each
orbital split apart into orbital split apart into
its 3 dimensional its 3 dimensional
axes.axes.
Relax, this is easy.Relax, this is easy.

7. Write out the electron configuration Write out the electron configuration
for Sodiumfor Sodium
Na, 11eNa, 11e
--
1s1s
22
2s2s
22
2p2p
66
3s3s
11
We are now going to We are now going to
represent each electron represent each electron
as a ‘half arrow”.as a ‘half arrow”.
We must fill in (build We must fill in (build
up) the electrons as we up) the electrons as we
did previously but show did previously but show
them using arrows on them using arrows on
the orbital notation the orbital notation
diagram.diagram.
First one in an orbital is First one in an orbital is
placed up (+placed up (+½½ spin) spin)

8. Write out the electron configuration Write out the electron configuration
for Boronfor Boron
B, 5eB, 5e
--
1s1s
22
2s2s
22
2p2p
11
We are now going to We are now going to
represent each electron represent each electron
as a ‘half arrow”.as a ‘half arrow”.
We must fill in (build We must fill in (build
up) the electrons as we up) the electrons as we
did previously but show did previously but show
them using arrows on them using arrows on
the orbital notation the orbital notation
diagram.diagram.
First one in an orbital is First one in an orbital is
placed up (+placed up (+½½ spin) spin)

9. Write out the electron configuration Write out the electron configuration
for Titaniumfor Titanium
Ti, 22eTi, 22e
--
1s1s
22
2s2s
22
2p2p
66
3s3s
22
3p3p
66
4s4s
22
3d3d
22

10. On your own. CalciumOn your own. Calcium
Ca, 20eCa, 20e
--
1s1s
22
2s2s
22
2p2p
66
3s3s
22
3p3p
66
4s4s
22

11. HomeworkHomework
Complete the Electron Configuration Complete the Electron Configuration
Homework WKST.Homework WKST.