Answer: singly with parallel spins.
- A in pairs first
- B in a random order
- C singly with parallel spins
- D starting from the top orbital
Correct answer: C. singly with parallel spins
Explanation: Hund’s rule: each orbital of equal energy is singly filled with parallel spins before any pairing begins.
Bohr's model: electrons occupy fixed circular shells (K, L, M) around the nucleus, with each shell holding up to 2n2 electrons.
Concept context
Explore how electrons are arranged inside an atom. Covers Bohr's model, quantum numbers, Heisenberg's uncertainty principle, shapes of s, p, d orbitals, and electronic configuration rules.