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Do Now
• Describe the 3 rules used to find an element’s electron configuration (hint: Aufbau, Pauli, Hund…)
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Do Now
• Describe the 3 rules used to find an element’s electron configuration
• Aufbau Principle – fill up low energy levels first
• Pauli Exclusion Principle – only 2 electrons per orbital
• Hund’s Rule – electrons go to their own orbital before they fill up an occupied orbital
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Objective
• I can find the electron configuration of different elements using a mastery quiz
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After today, you will be able to…
1. Express the arrangement of electrons through electron configurations in the proper long-form notation
2. Write noble gas notations 3. Identify elements from their
electron configuration
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Why Does this Matter?• Writing electron configurations
is like knowing the “address” of an element.
• Knowing the electron configuration can help you locate an element and electrons quickly and efficiently.
• It also tells you which electrons will be involved in chemical bonding.
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Homework
• Complete ‘Electron Configuration Part II’ homework on back of guided notes.
• Due Monday/Tuesday
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Agenda
• Do Now, Objective (7 min)• Review – Electron configurations
(10 min)• Guided Practice (10 min)• Independent Practice (15 min)• Battleship Practice (15 min)• Mastery Quiz (15 min)
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Electron Configurations
• a method of indicating the arrangement of electrons in a particular element or ion.
• You use the total amount of electrons
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Electron Configurations
Tell us three things
1.The energy level that the electrons occupy (which you get from the period number)
2.Energy sublevels (s, p, d, f)
3. Number of electrons an atom has
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It’s Like Driving!
Rule 1 – Aufbau’s Principle– An electron fills the lowest energy level that it can first
– Just like sitting at a concert
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It’s Like Driving!
Rule 2 – Pauli Exclusion Principle– Each orbital can hold a maximum of two electrons
– “Two to a seat”
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It’s Like Driving!
Rule 3 – Hund’s Rule– Electrons will fill sublevels of equal energy value one at a time before doubling up
– You would sit by yourself before doubling up
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Example: Write the electron configuration for HydrogenHydrogen has 1e-:
1s1
Energy Level (n)
“The street”Sublevel“Neighborhood”
# of electrons“The house”
Hydrogen = “Home”
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You try!
• Sulfur
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You try!
• Sulfur
1s22s22p63s23p4
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You try!
• Zinc
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You try!
• Zinc
1s22s22p63s23p64s2 3d10
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1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
What element is represented by the
electron configuration?
______________________________
Bromine
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Electron Configuration - Carbon
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Electron Configuration - Aluminum
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Electron Configuration - Germanium
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Independent Practice• Complete the five independent
practice problems silently• You have eight minutes• Go!
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Independent Practice
• Complete the five independent practice problems silently• Mg – 1s22s22p63s2
• Cr - 1s22s22p63s23p64s2 3d4
• Ar – 1s22s22p63s23p6
• Ca - 1s22s22p63s23p64s2
• Se – 1s22s22p63s23p64s23d104p4
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Battleship Practice!• Complete the ‘Battleship’ activity
with a partner• 15 min
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Noble Gas Configuration• It is a shortcut to writing electron
configurations• Uses the previous noble gas to
write the electron configuration
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Noble Gas Configuration• Steps to writing the noble gas
configuration1. Find the noble gas that comes
right before the element2. Put brackets “[ ]” around the
noble gas’s symbol.3. Continue the electron
configuration normally, after the noble gas.
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Guided Practice
• Potassium
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Guided Practice
• Chlorine
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Guided Practice
• Iodine
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Independent Practice• Complete the five independent
practice problems silently• You have eight minutes• Go!
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Mastery Quiz
• You have 15 minutes to complete the mastery quiz
• You may use– Periodic table