Group 7

Recall the specific physical and chemical properties characteristic of Group 7 elements.

Explain how the properties of Group 7 elements are fundamentally tied to the arrangement of electrons in their outer shell.

Identify Group 7 elements as the halogens, describing them as non-metals that consist of diatomic molecules.

Describe how halogens react with metals to form ionic compounds, and with other non-metallic elements to form molecular compounds.

Observe and predict property trends down Group 7, including the increase in relative molecular mass, melting point, and boiling point.

Understand that, unlike Group 1, the chemical reactivity of the halogens decreases as you move down the group.

Explain the principle of displacement, where a more reactive halogen can displace a less reactive halogen from an aqueous solution of its salt.