Question

Which of the following rules says the electrons would go first to lower energy levels and then to the higher energy levels?

• A. Aufbau Principle
• B. Pauli's Exclusion Principle
• C. Hund's Rule
• D. Heisenberg's Uncertainty Principle

Answer 1

The correct option is A Aufbau Principle

According to Aufbau principle, in the ground state of atoms the orbitals are filled in order of increasing energies based on (n + l) rule i.e. from lower energy levels to higher energy levels.