A-Level Chemistry Practice Questions - A-Level Chemistry Exam

There is a small dip in first ionisation energy between Group 2 and Group 13 (e.g., Mg to Al). What is the main reason?

Al has a larger nuclear charge so electrons are held more tightly The outermost electron in Al is in a 3p orbital, which is at slightly higher energy than the 3s orbital in Mg Al has paired electrons in 3s which repel each other Mg has a smaller atomic radius than Al

Correct Answer:

The outermost electron in Al is in a 3p orbital, which is at slightly higher energy than the 3s orbital in Mg

Access more questions from this quiz

Continue to A-Level Chemistry Practice Questions - A-Level Chemistry Exam for more practice questions and the full quiz experience.

Access More Questions