For principle quantum number n=3 the value of magnetic quantum number will be:
Correct answer: C. 5
- A. 3
- B. 6
- C. 5
- D. 7
Explanation
The principal quantum number (n) determines the number of sublevels in a given energy level. For n = 3, the possible azimuthal quantum numbers (ℓ) are 0, 1, and 2. The magnetic quantum number (mℓ) depends on the azimuthal quantum number, ranging from -ℓ to +ℓ. For ℓ = 2, mℓ can be -2, -1, 0, 1, or 2, resulting in 5 possible values, thus making Option C (5) correct. Options A (3), B (6), and D (7) do not accurately reflect the range of mℓ values for ℓ = 2.
Last updated
About Quantum Numbers
Quantum numbers describe an electron's energy level, subshell, orbital orientation and spin. You examine the principal, azimuthal, magnetic and spin quantum numbers, their allowed values, orbital capacity and how they determine electronic configurations and distinguish electrons within an atom.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.