Electron Configuration, Aufbau
Diagram, Abbreviated
Configurations, Ions
• Objective
– Today I will be able to:
• Calculate the electron configuration for elements and
ions on the periodic table
• Evaluation/ Assessment
– Informal assessment – student responses when
reviewing electron configuration problems.
– Formal Assessment – collecting and analyzing
responses to electron configuration worksheets
and the exit ticket
Lesson Sequence
• Warm – Up
• Explain: electron
configurations using 3d
orbitals.
• 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
• Electron Configuration Practice
• Exit Ticket
Warm - Up
• How many electrons can each orbital hold?
–
–
–
–
s=
p=
d=
f=
• Write the electron configuration for the following
elements
– Helium
– Nitrogen
– Silicon
Objective
• Today I will be able to:
– Calculate the electron configuration for elements
on the periodic table
Homework
• Electron Configuration Practice
Agenda
•
•
•
•
•
Warm – Up
STEM Fair Half Sheet
Electron Configuration Notes
Electron Configuration Practice
Exit Ticket
STEM Fair Half Sheet
Complete the sheet at your desk as
accurately as possible
Electron Configuration
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
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
Complete Electron Configuration
Practice Worksheet 19 - 36
Abreviated Electron Configuration
• Scientists are lazy ;)
• We need a shorthand way to represent
electron configuration
• It would take a long time to write the
configuration for elements with a lot of
electrons
• 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
Complete the practice. If you have
questions, ask Ms. Ose for help
To the back of the worksheet add
the following problems:
• Write the electron configuration for the
following ions:
– Mg2+
– N3– Ag+
Exit Ticket
• What is wrong with the following
configurations?
– Al – 1s22s22p63s3
– Ti – 1s22s22p63s22p64s24d2
• Mol Monday!
– How many atoms are in 10.0 g of Al