To find the electron configuration of oxygen:
Look at the periodic table and find an atomic number of oxygen, which is 8.
Fill these 8 electrons in the following order: 1s, 2s, and then 2p.
Write the complete electron configuration of oxygen: 1s²2s²2p⁴.
Identify the noble gas before oxygen, helium, and write using shorthand notation: [He]2s²2p⁴.
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