Which statement is not correct about the Period 2 elements from lithium to neon?
Beryllium has a lower first ionisation energy than boron because boron has a greater nuclear charge.
Lithium has the largest atomic radius in the period.
Nitrogen has a higher first ionisation energy than oxygen because of repulsion between paired electrons in oxygen's 2p2\text{p}2p subshell.
Neon has the highest first ionisation energy in the period.
37 exam-style questions on AQA A Level Chemistry Group 7(17), the halogens, covering Trends in properties and Uses of chlorine and chlorate(I). Each one has a worked solution and a mark scheme showing where the marks go.