Electron Configuration Contemporary Chemistry Mrs. Coyle A) -Electron

Electron Configuration Contemporary Chemistry Mrs. Coyle A) -Electron Configuration -Orbital Filling

Electron Configuration The way electrons are arranged around the nucleus.

Three rules are used to build the electron configuration: Aufbau principle Pauli Exclusion Principle Hunds Rule

Aufbau Principle Electrons occupy orbitals of lower energy first.

Pauli Exclusion Principle An orbital can hold only two electrons and they must have opposite spin.

Hunds Rule In a set of orbitals, the electrons will fill the orbitals in a way that would give the maximum number of parallel spins. Analogy: Students could fill each seat of a school bus, one person at a time, before doubling up.

Aufbau Diagram for Hydrogen Aufbau Diagram

for Helium Aufbau Diagram for Lithium Aufbau

Diagram for Beryllium Aufbau Diagram for Boron

Aufbau Diagram for Carbon Aufbau Diagram

for Nitrogen Aufbau Diagram B)

-Standard and Shorthand Notation -Arrow Diagram Aufbau Diagram for Fluorine

Standard Notation of Electron Configuration Example: Fluorine: Number of electrons in the sub level 2,2,5

1s 2s 2p y g r e

n E n i Ma el v s

r e e L b m Nu , 2

1, 2 2 2 5

Sublevels Shorthand Notation Use the last noble gas that is located in the periodic table right before the element. Write the symbol of the noble gas in

brackets. Write the remaining configuration after the brackets. Ex: Fluorine: [He] 2s2 2p5 Arrow Diagram

Blocks in the Periodic Table

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