Chapter 5 Orbital Filling Diagrams and Electron Dot Diagrams

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

An “s” sublevel has one orbital

A “p” sublevel has three orbitals

A “d” sublevel has five orbitals

An “f” sublevel has seven orbitals

Orbital Filling Diagrams

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

RIGHT WRONG A. General Rules 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.

O 8e - Orbital Diagram Electron Configuration 1s 2 2s 2 2p 4 B. Notation 1s 2s 2p

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 10 How many of the electrons are paired?

Electron Dot Diagrams Step 1: Write the electron configuration

Electron Dot Diagrams Step 2: Determine the number of valence electrons. The valence electrons are the electrons in the outer energy level.

Electron Dot Diagrams Step 3: Write the symbol of the element surrounded by valence electrons. Place one electron on each side before pairing them up.

Draw the electron dot diagram for oxygen.

Draw the electron dot diagram for selenium. (Z = 34)

Draw the electron dot diagram for chlorine. (Z = 17)

Draw the electron dot diagram for hydrogen. (Z = 1)

Preview: Lewis Structures Lewis structures will not be part of this chapter test but they illustrate a common use of electron dot diagrams.