Chemistry (11th Grade)
Electron Configuration
What is the correct order of filling electron sublevels according to the Aufbau principle?
1s, 2s, 2p, 3s, 3p, 4s, 3d
1s, 2s, 3s, 2p, 3p, 4s, 3d
1s, 2p, 2s, 3s, 3p, 4s, 3d
1s, 2s, 3p, 3s, 4s, 3d, 2p