Chapter 5 Orbital Filling Diagrams Orbital Filling Diagrams

Chapter 5 Orbital Filling Diagrams

Orbital Filling Diagrams • Orbital filling diagrams illustrate the pairing of the electrons in an atom.

Remember how we illustrate the sublevels with boxes.

An “s” sublevel has one orbital

A “p” sublevel has three orbitals

A “d” sublevel has five orbitals

An “f” sublevel has seven orbitals

Pauli Exclusion Principle –Each orbital can hold TWO electrons with opposite spins.

Hund’s Rule • Within a sublevel, place one e- per orbital before pairing them. • All electrons in singly filled orbitals have the same direction of spin.

A. General Rules • Which orbital filling diagram correctly follows Hund’s Rule for p 4? WRONG RIGHT

Orbital Filling Diagrams

B. Notation • Orbital Diagram for oxygen (1 s 22 p 4) O 8 e- 1 s 2 s 2 p How many of oxygen’s electrons are paired?

What type of sublevel is this?

Make the orbital filling diagram for d 8 How many of the electrons are unpaired?

What type of sublevel is this?

Make the orbital filling diagram for f 9 How many of the electrons are paired?

How many electrons in an Fe atom are paired? (Shortcut for Determining the pairing of electrons. ) • What is the electron configuration of Fe? (Z = 26) • 1 s 2 2 p 6 3 s 2 3 p 6 4 s 2 3 d 6 • 4 electrons are unpaired • 22 electrons are paired

Homework Study Guide Chapter 5 (Due Friday)