Which of the following arrangements represe..

Question 1 Report

Which of the following arrangements represents the correct order of electronic energy level?

1s 2p 2s 3p 3s 3d 4s

1s 2s 2p 3s 3p 3d 4s

1s 2s 2p 3s 3p 4s 3d

1s 2s 3s 2p 3p 4s 3d