Exploring Electron Configurations

This video tutorial covers electron configurations, quantum numbers, and the Pauli Exclusion Principle. It explains how to determine electron configurations using the periodic table and discusses the importance of energy levels and orbital diagrams. The tutorial also introduces Hund's Rule and provides guidance on shorthand electron configurations and irregularities. Practice examples are included to reinforce the concepts.

Which sections of the book should you read for extra practice on electron configurations and orbital diagrams?

• 6.1 and 6.2

• 6.8 and 6.9

• 5.3 and 5.4

• 7.1 and 7.2

According to the Pauli Exclusion Principle, no two electrons in the same atom can have:

• The same spin

• The same energy level

• The same set of quantum numbers

• The same orbital

What does the large number in an electron configuration represent?

• The number of electrons

• The energy level

• The spin of the electron

• The type of orbital

In the periodic table, which block corresponds to groups 1 and 2?

• F block

• S block

• D block

• P block

Which orbital is filled first according to the order of increasing energy?

• 2s

• 3s

• 1s

• 2p

What does Hund's Rule state about electron placement in orbitals?

• Electrons fill the lowest energy orbital first

• Electrons pair up in orbitals before occupying new ones

• Electrons occupy orbitals singly before pairing up

• Electrons have opposite spins in the same orbital

In an orbital diagram, what does a half arrow pointing up represent?

• No spin

• Paired electrons

• Positive spin

• Negative spin

What is another name for shorthand electron configurations?

• Valence configurations

• Core configurations

• Expanded configurations

• Condensed configurations

Which noble gas is used in the shorthand configuration for lithium?

• Krypton

• Argon

• Neon

• Helium

Why is the electron configuration for chromium considered an irregularity?

• It has a half-filled 4s and 3d sublevel for extra stability

• It has a fully filled 4s and 3d sublevel

• It has fewer electrons than expected

• It has more electrons than expected