Hund’s rule states that:
 
1.  No two electrons can be in two separate orbitals.
2. No two electrons can be present with similar spin in an orbital.
3. Two electrons can exist in d orbital.
4. None of the above.
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.