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QUESTION

# What is the ground state electron configuration of oxygen?

Oxygen's ground state is 1s^(2)2s^(2)2p^(4).

Oxygen has 8, so it has 8 electrons. Each "s" subshell can only hold 2 electrons before it begins to fill a "p" subshell.

Remember that the first energy level only contains a single "s" subshell, which means that there is no such thing as a "1p" subshell.

You can use the following diagram to show you the order of filling orbitals.

The diagram shows that you fill the1s, then the 2s, then the 2p and so on until you have added enough electrons.

Therefore, you add 2 electrons to the 1s and two electrons to the 2s. That leaves 4 electrons to go into the 2p level.

The electron configuration of O is 1s^2 2s^2 2p^4.

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