Question Detail
Question
What is the electron configuration of oxygen (atomic number 8)?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Oxygen has atomic number 8, meaning it has 8 electrons. The electron configuration follows the filling order: 1s² (2 electrons), 2s² (2 electrons), and 2p⁴ (4 electrons). The 2p subshell has four electrons, which according to Hund's rule results in two unpaired electrons.
Hint
Count electrons through the 1s, 2s, and 2p orbitals until reaching 8 total electrons.