Finish 1s electron lab, orbital
diagrams, Hund’s rule, Pauli
exclusion, valance electrons
• Objective
– Today I will be able to:
• Construct a model of where electrons in the 1s orbital are located.
• Explain the behavior of electrons based on Pauli’s exclusion
Principle and Hund’s Rule
• Illustrate the location of an electron by drawing an orbital diagram
• Identify the location of valance electrons in an atom
• Evaluation/ Assessment
– Informal assessment – student responses when reviewing
electron configuration problems, orbital diagrams and
valence electrons. Listening to group interactions on
practice sheets and lab
– Formal Assessment – collecting and analyzing responses to
electron configuration worksheet 2 and the where is the
electron lab. Reviewing responses to the exit ticket
Lesson Sequence
• Warm – Up
• Explore: Students will be
sorted into groups and will
complete the where is the 1s
electron lab located
– I will be assessing students
progress during the lab as I
monitor group discussions
• Evaluate: Students will
complete an electron
configuration WS (assessment)
• Explain: principles, rules and
diagrams of electron
configurations
• Elaborate: Students complete
orbital diagrams worksheet
• Evaluate: Students will draw
orbital diagrams on the board
and explain their answers
(informal assessment)
• Explain: Valance Electrons
Notes
• Elaborate: Students complete
a valance electrons worksheet
• Evaluate: Students will share
responses to the worksheet
• Exit Ticket
Warm - Up
Write the electron configuration
for the following elements:
• Magnesium
• Iron
• Arsenic
What is the abbreviated configuration
for Sulfur?
Objectives
• Today I will be able to:
– Construct a model of where electrons in the 1s
orbital are located.
– Explain the behavior of electrons based on Pauli’s
exclusion Principle and Hund’s Rule
– Illustrate the location of an electron by drawing an
orbital diagram
– Identify the location of valance electrons in an
atom
Homework
• Finish Orbital Diagrams WS
Agenda
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Warm – Up
Finish Lab (15 minutes)
Electron Configuration Practice
Notes Pauli Exclusion Principle, Hund’s Rule,
Orbital Diagrams
Orbital Diagram Practice
Review Practice as a class
Valence Electron Notes
Valance Electron Practice
Exit Ticket
Finish the where is the electron lab?
When you finish the lab, hand in one copy per
group.
Staple together your lab sheet, the answers to
the questions, your graph and your target.
Turn it in on my desk and take a copy of the
electron configurations practice worksheet
and begin to work on it.
Complete the Electron Configuration
Practice Worksheet
Hand in upon completion
Electron Configuration Rules and
Principles
Pauli Exclusion Principle
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An orbital can hold a max of 2 eTo occupy the same orbital, they must spin
in opposite directions
If 2 e- occupy an orbital, they are said to be
“paired”
If only 1 e- is present in an orbital, it is
“unpaired”
Pauli Exclusion Principle
Hund’s Rule
• e- occupy orbitals so that a max number
of unpaired e- result
• More stable arrangement
Orbital Diagram
• Shows the electrons in their sublevels
• Represented with arrows
Orbital Diagram
1s
2s
2px
2py 2pz
H
↑
He
↑↓
C
↑↓
↑↓
↑
↑
Ne
↑↓
↑↓
↑↓
↑↓
↑↓
Complete the Electron Configuration
and Orbital Diagram Practice
Worksheet
Review the Electron Configuration
and Orbital Diagram Practice
Worksheet
Valence Electron Notes
Valence Electrons
• Electrons in the outermost energy level
• Determines the number of electrons an
atom gains, loses, or shares
• These are the electrons that are
involved in bonding
Valence Electrons (skip)
• Write the electron configuration for
oxygen
• 1s2 2s2 2p4
• Oxygen has six valence electrons (2s2 and
2p4)
Valence Electrons (skip)
• Write the electron configuration for
potassium
• 1s2 2s2 2p6 3s2 3p6 4s1
• Potassium has 1 valence electron (4s1)
Valence Electrons
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Exceptions are the d and f sublevels! Use
the number of electrons in the last s sublevel
(and the p sublevel, if available)
Write the electron configuration for Bromine
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
Bromine has seven valence electron (4s2 and
4p5)
Foreshadowing: Octet Rule
• Most atoms want 8 electrons in their
outermost level OR full s and/or p
sublevels
• Atoms will form bonds to achieve the
desired amount of electrons
• Atoms are most stable when they have a
full outer shell
Complete Valence Electrons
Worksheet
Review Valence Electrons
Worksheet as a class
Exit Ticket
• For the element Chlorine:
– Write the electron configuration
– Write the abbreviated electron configuration
– Draw an orbital diagram
• Explain why you drew the electrons in the location of
the orbital's that you did
– Determine the number of valence electrons