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
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