Question

complete the orbital diagram for the element oxygen
blank orbital diagram
increasing energy
fill in the lowest energy orbitals first!

Explanation:

Step1: Recall oxygen's atomic number

Oxygen has an atomic number of 8, so it has 8 electrons.

Step2: Fill electrons according to Aufbau principle

Fill the lowest - energy orbitals first. The 1s orbital can hold 2 electrons, the 2s orbital can hold 2 electrons, and then we fill the 2p orbitals. According to Hund's rule, in the 2p orbitals (which has 3 sub - orbitals), we first place one electron in each of the three 2p sub - orbitals with the same spin, and then start pairing up. So, 2 electrons in 1s, 2 electrons in 2s, and 4 electrons in 2p.

Answer:

1s: ↑↓
2s: ↑↓
2p: ↑ ↑ ↑↓