SS1 · Atomic Structure · CHM/ATS — SS1.01

Electron Configuration Notation, Orbital notation, and noble gas notation

Covers writing standard spdf electron configurations for atoms and ions using fundamental quantum distribution rules.

What students will learn

Define the term electron configuration and orbital notation.
Apply the Aufbau principle, Pauli exclusion principle, and Hund’s rule to determine electron distribution.
Write the standard spdf notation for elements with atomic numbers 1 to 20.
Illustrate the electronic structure of atoms using orbital box diagrams.
Construct noble gas shorthand configurations for elements with atomic numbers 21 to 36.

Which of the following is the correct ground-state electron configuration for a neutral Sodium atom (Na, atomic number 11)?
- A. 1s² 2s² 2p⁶ 3s¹
- B. 1s² 2s² 2p⁵ 3s²
- C. 1s² 2s² 2p⁶ 3s²
- D. 1s² 2s¹ 2p⁶ 3s²
What is the noble gas notation for Chlorine (Cl, atomic number 17)?
- A. [He] 2s² 2p⁵
- B. [Ne] 3s² 3p⁵
- C. [Ar] 3s² 3p⁵
- D. [Ne] 3s² 3p⁶

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