Answer: Neutrons.
- A Protons
- B Electrons
- C Neutrons
- D Nuclei
Correct answer: C. Neutrons
Explanation: Isotopes have the same atomic number but different mass numbers because they have different neutrons.
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.