Question

select the correct answer. what is the order in which electrons start filling the orbitals? a. 1s 2s 2p 3s 3p 4s 3d 4p b. 1s 2s 2p 3s 3p 3d 4s 4p c. 1s 2s 2p 3s 4s 3p 3d 4p d. 1s 2s 2p 3s 4s 4p 3p 3d e. 1s 2s 2p 3s 4s 3p 4p 3d

Explanation:

Electrons fill orbitals in order of increasing energy following the Aufbau principle. The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p. This is because the 4s orbital has a lower energy than the 3d orbital until the 4s is filled.

Answer:

A. 1s 2s 2p 3s 3p 4s 3d 4p