Electron Configuration Rules: Aufbau & Pauli Exclusion Principle, Hund's Rule

This video tutorial explains the three fundamental rules for writing electron configurations: the Aufbau principle, Hund's rule, and the Pauli exclusion principle. The Aufbau principle states that electrons fill lower energy levels first. Hund's rule emphasizes that electrons prefer to be unpaired in orbitals when possible. The Pauli exclusion principle requires that electrons in the same orbital have opposite spins. Understanding these rules is crucial for correctly writing electron configurations.

What is the primary focus of the video tutorial?

• Understanding the periodic table

• Learning about electron configurations and their rules

• Exploring atomic structure

• Studying chemical reactions

According to the Aufbau principle, which energy level do electrons fill first?

• The third energy level

• The lowest energy level

• The second energy level

• The highest energy level

What does Hund's rule suggest about electron placement in orbitals?

• Electrons should fill the highest energy level first

• Electrons prefer to be alone in orbitals

• Electrons should pair up immediately

• Electrons must have the same spin

In the context of the Pauli exclusion principle, what must be true about two electrons in the same orbital?

• They must have the same spin

• They must be in the same energy level

• They must have opposite spins

• They must be in different energy levels

Which principle explains why electrons in the same orbital have opposite spins?

• Pauli exclusion principle

• Bohr's model

• Hund's rule

• Aufbau principle