4-3 Electron Configuration

Multiple Choice

What is the GREATEST number of valence electrons an atom can have in the 2nd shell?

• 1
• 3
• 6
• 8

Multiple Choice

Define Aufbau principle

• Sub shells (boxes) must have at least 1 e- in each orbital before placing another e- and filling

• Rule that electrons occupy the orbitals of lowest energy first

• No two electrons in the same atom can have the same set of four quantum numbers

Multiple Choice

What does the Pauli Exclusion Principle state about electrons in an atom?

• No two electrons can have identical quantum numbers

• Electrons can occupy the same orbital with identical spins

• Maximum three electrons per orbital

• Electrons in different orbitals must have the same spin

Multiple Choice

According to Hund's Rule, how should electrons be arranged in degenerate orbitals?

• All electrons should be paired first

• Electrons should occupy orbitals singly before pairing

• Electrons can be in any spin orientation

• Electrons should fill the lowest energy orbitals first

Multiple Choice

What is incorrect about this orbital diagram?

• Both arrows in the 2p box should be pointing up

• There is nothing incorrect with this diagram

• There should be 1 electron (arrow) in the first 2p box and one in the 2nd 2p box

• All the arrows should be pointing up.

Categorize

Options (8)

hydrogen (H)

sodium (Na)

boron (B)

aluminum (Al)

nitrogen (N)

phosphorus (P)

chlorine (Cl)

bromine (Br)

Organize these elements into the right valence electron categories.

1 valence electron

3 valence electrons

5 valence electrons

7 valence electrons