Question

The Aufbau Principle describes that

• A. electrons with the same spin cannot occupy the same orbital.
• B. Since electrons repel each other, electrons will occupy single orbitals within and energy level before doubling up.
• C. electrons fill lower energy levels first before occupying higher energy levels.
• D. None of these

Answer 1

Answer:

C. electrons fill lower energy levels first before occupying higher energy levels.