Sg-a-level-h1-chemistry Practice Questions - Sg-a-level-h1-chemistry Exam

Access More Questions

Why is the first ionization energy of Nitrogen (Z = 7) higher than that of Oxygen (Z = 8), despite Oxygen having a higher nuclear charge?

Oxygen experiences inter-electron repulsion between paired 2p electrons in the same orbital. Nitrogen has a smaller atomic radius than Oxygen. Nitrogen's 2p electrons experience significantly greater nuclear shielding than Oxygen's. Oxygen loses an electron from the lower-energy 2s subshell.

Correct Answer:

Oxygen experiences inter-electron repulsion between paired 2p electrons in the same orbital.

Access more questions from this quiz

Continue to sg-a-level-h1-chemistry Practice Questions - sg-a-level-h1-chemistry Exam for more practice questions and the full quiz experience.

Access More Questions