Answer :
Final answer:
In accordance with the Aufbau principle, atomic orbitals are filled in order of increasing energy. The correct sequence is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p. Therefore, the first given list correctly represents the order in which orbitals are filled. So, the correct option is 1) 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
Explanation:
The Aufbau principle states that atomic orbitals are filled with electrons in order of increasing energy, with each electron occupying the lowest energy orbital that is available. This principle is a key concept when determining the electron configurations of atoms. According to the principle and the general energy levels, the correct order of filling atomic orbitals is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, and so on. After 2p orbital, the next orbital to be filled is the 3s orbital. Following 4s, the 3d orbital is filled. Lastly, after 6s, the 4f orbital is the next to be filled as per the established sequence.
So, considering the order based on the Aufbau principle and the increasing energy levels of orbitals, the list of orbitals filled in the correct ordering is the first option: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.
