Maine Science High School Practice Questions - Maine Science Assessment - Third Year High School Exam

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Why does Nitrogen (N) have a slightly higher first ionization energy than Oxygen (O) despite Oxygen being further to the right in Period 2?

Nitrogen has a half-filled 2p subshell providing extra stability. Oxygen has a higher effective nuclear charge than Nitrogen. Nitrogen's valence electrons are in a higher principal energy level. Oxygen's atomic radius is larger than Nitrogen's atomic radius.

Correct Answer:

Nitrogen has a half-filled 2p subshell providing extra stability.

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