Questions: Complete orbital diagrams for the following elements. Insert arrows into the proper boxes and label each box with the correct level and sublevel designation. 1. O (oxygen)

Solution Steps

Oxygen has an atomic number of 8, which means it has 8 electrons. The electron configuration for oxygen is: 1s² 2s² 2p⁴

• The 1s sublevel has 1 orbital and can hold 2 electrons.
• The 2s sublevel has 1 orbital and can hold 2 electrons.
• The 2p sublevel has 3 orbitals and can hold up to 6 electrons, but oxygen only has 4 electrons in the 2p sublevel.

• Fill the 1s orbital with 2 electrons (↑↓).
• Fill the 2s orbital with 2 electrons (↑↓).
• Fill the 2p orbitals with 4 electrons. According to Hund's rule, each orbital in the 2p sublevel gets one electron before any gets a second. So, the first three 2p orbitals each get one electron (↑), and the fourth electron pairs up in one of the 2p orbitals (↑↓).

Final Answer

1s  2s  2p
↑↓  ↑↓  ↑  ↑  ↑  ↓