Electrons Pictured Lesson 17 and Lesson 18

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The Rules of Electron Configuration  3 RULES of electron configuration  ___________  ____________  ___________

Practicing Aufbau  H  He  Be  Ne

Practicing Pauli  H  He  Be  Ne

Practicing Hund  H  He  Be  Ne

Sample Problem  The electron configuration of B is ______________  How many electrons are present? ____  What is Boron’s atomic number? ____  Write the orbital notation:

Practice  The electron configuration of N is ______________  How many electrons are present? ____  What is Nitrogen’s atomic number? ____  Write the orbital notation:

Practice  The electron configuration of F is ______________  How many electrons are present? ____  What is Flourine’s atomic number? ____  Write the orbital notation

1S 2 ELECTRON CONFIGURATIONENERGY LEVEL DIAGRAM

Periodic Table as Road Map

Electron Configuration Example H → He → Li → F →

Electron Configuration Practice  H →  Be →  C →  Ne →

The Rules: Noble Gases  Short hand approach to writing electron configurations:  The RULES  1. Locate the given ________  2. Find the ______ gas that comes right before the element in question  Noble gases are in group ____  3. Write the symbol for that noble gas in ________  4. Write the remaining ___________ configuration

Noble Gas Configuration Example  Rubidium  1. Find the given element: Atomic # ____  2. _______  3. [_____]  4. [_____]____

Noble Gas Configuration Practice  Sulfur  Chlorine  Argon  Potassium  Calcium

Core vs. Valence Electrons  Core electrons __ _____participate in chemical reactions.  Valence electrons ____ participate in chemical reactions  They are important because they are the electrons that ______, ____ or _______in chemical reactions

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