Do Now Describe the 3 rules used to find an element’s electron configuration (hint: Aufbau, Pauli, Hund…)

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

Objective I can find the electron configuration of different elements using a mastery quiz

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

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.

Homework Complete ‘Electron Configuration Part II’ homework on back of guided notes. Due Monday/Tuesday

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)

Electron Configurations a method of indicating the arrangement of electrons in a particular element or ion. You use the total amount of electrons

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

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

It’s Like Driving! Rule 2 – Pauli Exclusion Principle – Each orbital can hold a maximum of two electrons – “Two to a seat”

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

Example: Write the electron configuration for Hydrogen Hydrogen has 1e - : 1s 1 Energy Level (n) “The street” Sublevel “Neighborhood” # of electrons “The house” Hydrogen = “Home”

You try! Sulfur

You try! Sulfur 1s 2 2s 2 2p 6 3s 2 3p 4

You try! Zinc

You try! Zinc 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10

1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 What element is represented by the electron configuration? ______________________________ Bromine

A New Way to Do it!

Electron Configuration - Carbon

Electron Configuration - Aluminum

Electron Configuration - Germanium

Independent Practice Complete the five independent practice problems silently You have eight minutes Go!

Independent Practice Complete the five independent practice problems silently Mg – 1s 2 2s 2 2p 6 3s 2 Cr - 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 4 Ar – 1s 2 2s 2 2p 6 3s 2 3p 6 Ca - 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 Se – 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4

Battleship Practice! Complete the ‘Battleship’ activity with a partner 15 min

Noble Gas Configuration It is a shortcut to writing electron configurations Uses the previous noble gas to write the electron configuration

Noble Gas Configuration Steps to writing the noble gas configuration 1.Find the noble gas that comes right before the element 2.Put brackets “[ ]” around the noble gas’s symbol. 3.Continue the electron configuration normally, after the noble gas.

Guided Practice Potassium

Guided Practice Chlorine

Guided Practice Iodine

Independent Practice Complete the five independent practice problems silently You have eight minutes Go!

Mastery Quiz You have 15 minutes to complete the mastery quiz You may use –Periodic table