Atomic StructureKey Facts
Physical Properties — Colour and State at Room Temperature
Part of Group 7: Halogens — GCSE Chemistry
This key facts covers Physical Properties — Colour and State at Room Temperature within Group 7: Halogens for GCSE Chemistry. Revise Group 7: Halogens in Atomic Structure for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 5 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 12
Practice
20 questions
Recall
20 flashcards
📌 Physical Properties — Colour and State at Room Temperature
Halogens exist as diatomic molecules (pairs of atoms: F₂, Cl₂, Br₂, I₂)
| Halogen | Colour | State at RT |
|---|---|---|
| Fluorine (F₂) | Pale yellow | Gas |
| Chlorine (Cl₂) | Green | Gas |
| Bromine (Br₂) | Orange/brown | Liquid |
| Iodine (I₂) | Grey/purple vapour | Solid |
Trends down the group:
- Colour gets darker
- Melting/boiling points increase (gas → liquid → solid)
- Reactivity decreases