The azimuthal quantum number ranges from 0 to n-1, derived from the algebraic theory of quantum mechanical angular momentum and the solution of the Schrödinger equation in three dimensions. Detailed explanations can be found in textbooks on quantum mechanics, particularly those covering the hydrogen atom. Online resources are also available for varying levels of understanding, from basic to advanced. Engaging with these materials can provide a deeper insight into the topic. Understanding the azimuthal quantum number is essential for grasping quantum mechanics fundamentals.