Transcript Electron Configuration

Electron Configuration
• Objective
– Today I will be able to:
• Calculate the electron configuration for elements on
the periodic table
• Evaluation/ Assessment
– Informal assessment – student responses when
reviewing electron configuration problems.
Listening to group interactions on practice sheets
– Formal Assessment – collecting and analyzing
responses to electron configuration worksheet 2
Lesson Sequence
• Warm – Up
• Explain: How to write electron
configurations
• Elaborate: write electron
configurations with a partner for
questions 1-18
• Evaluate: review the questions as
a class (informal assessment)
• Explain: electron configurations in
3d orbitals and Aufbau diagrams
• Elaborate: Students will complete
19-36 on electron configuration
WS with a partner
• Evaluate: review the questions as
a class (informal assessment)
• Explain: abbreviated electron
configurations
• Elaborate: Students will add a
column to the WS and repeat
write the abbreviated
configuration
• Evaluate: Abbreviated
configurations will be reviewed as
a class (informal assessment)
• Exit Ticket
Warm - Up
• According to the modern atomic theory
(Schrodinger’s model) where are the electrons
located?
• According to the Bohr model, where are the
electrons located?
Objective
• Today I will be able to:
– Calculate the electron configuration for elements
on the periodic table
Homework
• Have a great afternoon! 
Agenda
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Warm – Up
Electron Configuration Notes
Electron Configuration Practice
Exit Ticket
Electron Configuration
Label and color your periodic
table to match the periodic table
on the next slide…
Electron Configuration
n
1
2
3
4
5
6
7
p-block
s-block
d-block
n-1
f-block
n-2
Electron Configuration
• “address” of where each individual electron is
located in an atom
2
1s
Number of electrons
in the orbital
Energy Level (n)
Orbital
(Principal) Energy Level
• Symbol = n
• As atoms get bigger, there
are more electrons,
therefore more energy
levels
• Fill the lowest energy levels
first (ground state)
• Within each energy level,
we have one or more
sublevels
• These sublevels are called
orbitals
Orbitals
• Based on modern model of atom
• 3-D region around the nucleus indicating the
probable location of the electron
• 4 types of orbital (low  high energy)
– s
–p
–d
–f
Orbital Shapes
Orbitals cont.
• Each sublevel can hold a specific amount of
electrons
– S=2
– P=6
– D=10
– F=14
Now we can put these ideas
together and write an electron
configuration for an atom…
Examples
• Sodium (Na)
– Has 11 electrons (when neutral)
– Electron Configuration:
• 1s22s22p63s1
• Cobalt (Co)
– Has 27 electrons (when neutral)
– Electron Configuration
• 1s22s22p63s23p64s23d7
Warm-Up
• Complete the electron configuration
worksheet you received yesterday
• Don’t forget to use your periodic table!
Objective
• Today I will be able to:
– Calculate the electron configuration for elements
on the periodic table
Homework
• Complete the Electron Configuration Practice
Worksheet
Agenda
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Warm-Up
Group Practice: Using the Aufbau Diagram
Practice 4-5
Abbreviated Electron Configurations
Exit Ticket
Group Practice
• Lets try Hydrogen through Neon
• DO NOT WRITE ANY OF THIS DOWN
• Just follow along and participate as I show you
how to use the orbital diagram and how to
write electron configurations
Aufbau Diagram
• Instead of using the periodic table as a road
map, you can use the aufbau diagram to
determine the order that the electrons occupy
the different energy levels
• Electrons fill the lowest energy orbitals first
Aufbau Diagram
Why does 4s come before 3d?
• 3d is of slightly higher energy than 4s, but 4s is
further from the nucleus
• It takes less energy for a 3d electron to form pairs
then a 4s electron
Complete Electron Configuration
Practice Worksheet 4-5
Just do the evens!
Abbreviated Electron Configuration
• Scientists are lazy
• We need a shorthand way to represent
electron configuration
• How do we do this?
– Noble Gas Configuration
Noble Gas Configuration
• The last column on the periodic table is
referred to as the noble gases
• To write in abbreviated configuration:
– Find the last noble gas within the configuration
– Write the symbol
– Write the remaining configuration
• Example
– Ca - 1s2 2s2 2p6 3s2 3p6 4s2
• Noble Gas Configuration = [Ar] 4s2
Noble Gas Configuration
• Writing Noble Gas Configurations for ions is a
little bit different
• Must account for an electron being gained or
lost
– Chlorine Ion = Cl-1
• [Ne] 3s2 3p6
– Sodium Ion = Na+1
• [He] 2s2 2p6
Electron Configuration Practice
Worksheet
Complete the worksheet for
homework!
Exit Ticket
• Write the electron configuration for sulfur