Maximum Number of Orbitals for n = 4 and mₗ = 0 | JEE Mains PYQ | Structure of Atom
Q. The maximum number of orbitals which can be identified with n = 4 and ml = 0 is ______.
Explanation
Step 1: Possible values of l for n = 4

For n = 4, azimuthal quantum number (l) can have values:
l = 0, 1, 2, 3

Step 2: Condition for magnetic quantum number

For a given value of l, magnetic quantum number ml varies from −l to +l.
The given condition is ml = 0.

Step 3: Count allowed orbitals

For each value of l (0, 1, 2, 3), ml = 0 is allowed.

Thus, number of orbitals having ml = 0 for n = 4 is:

  • l = 0 → one orbital
  • l = 1 → one orbital
  • l = 2 → one orbital
  • l = 3 → one orbital
Step 4: Final count

Total orbitals = 4

Correct Answer = 4

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