Question

Principal Quantum number represents

• A. Quantization of angular momentum magnitude
• B. Quantization of angular momentum direction
• C. Quantization of energy
• D. Space quantization

Hint:

Principal quantum number (\(n\)) = shell number; higher \(n \Rightarrow\) higher energy and larger orbital.

Answer 1

The Correct Option is C

Step 1: Understand the principal quantum number (\(n\)).
The principal quantum number (\(n\)) defines the electron's energy level (shell) within an atom, influencing orbital size and electron energy. Step 2: Evaluate the options.
- (1) The azimuthal quantum number (\(l\)), not \(n\), determines the magnitude of angular momentum.
- (2) The magnetic quantum number (\(m_l\)) specifies the direction of angular momentum.
- (3) Correct — Energy is quantized and directly dependent on \(n\).
- (4) Space quantization is related to \(m_l\).
Final Answer: \[ \boxed{\text{Quantization of energy}} \]