Answer: No two electrons can have all four identical quantum numbers.
- A Two electrons in an atom can have exactly the same set of quantum numbers
- B No two electrons can have all four identical quantum numbers
- C Electrons generally repel each other due to their like electric charge
- D Electrons usually form spin-paired sets within every atomic orbital
Correct answer: B. No two electrons can have all four identical quantum numbers
Explanation: Pauli exclusion: no two electrons in an atom can have the same set of four quantum numbers (n, l, ml, ms).
In the photoelectric setup, light striking the metal plate ejects electrons that cross the evacuated tube to the collector, producing a measurable current on the ammeter.
Concept context
Photoelectric effect, de Broglie waves, Bohr's model, atomic spectra.