DE_Chem_2.3.1

DE_Chem_2.3.1_What Is the Configuration of Electrons Within an Atom?

the arrangement of electrons in the energy levels and orbitals within an atom

Electron Configuration

illustrates the configuration of electrons within the orbitals in an atom; electrons are represented by arrows pointing up or down (denoting each electron's spin) in a boxes representing each orbital

​​Orbital Diagram

Electron Configurations - a sample selection

Rules

Pauli exclusion principle: no two electrons can have exactly the same quantum number (because two electrons can occupy the same orbital, a 'spin' is assigned.

Hund's rule:all orbitals of the same energy will be filled with one electron before any orbital can take a second electron

​Noble gas notation

Match

Match each term with the correct illustration

Electron Configuration

Orbital Diagram

Noble gas notation

• Electron Configuration

• Orbital Diagram

• Noble gas notation

Multiple Choice

Electrons fill the orbitals in which of the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

• 1s, 2s, 3s, 4s, 5s, 6s, 7s, 1p, 2p, 3p, 4p, 5p, 6p, 7p, 1d, 2d, 3d, 4d, 5d, 6d, 7p

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

• 1s, 1p, 1d, 2s, 2p, 2d, 3s, 3p, 3d, 4s, 4p, 4d, 5s, 5p, 5d, 6s, 6p, 6d, 7s, 7p