Group 7 — The Halogens Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. How many outer-shell electrons does a halogen atom have?
- A. 1
- B. 5
- C. 7
- D. 8
2. What is the trend in reactivity as you go down Group 7?
- A. Reactivity increases
- B. Reactivity decreases
- C. Reactivity stays constant
- D. Reactivity increases then decreases
3. What type of compound is formed when chlorine reacts with sodium?
- A. A covalent gas
- B. An ionic metal halide
- C. A metallic alloy
- D. A giant covalent structure
4. Chlorine water is added to a colourless solution of potassium iodide, and the solution turns brown. What has happened?
- A. Chlorine has been reduced to chloride ions only
- B. Chlorine, being more reactive, has displaced iodine from potassium iodide
- C. Iodine has displaced chlorine because it is more reactive
- D. No reaction has occurred and the colour change is unrelated
5. A student is given three unlabelled halogens and asked to predict which is the most reactive. Which piece of reasoning is correct?
- A. The halogen with the highest melting point is most reactive
- B. The halogen highest up Group 7 is most reactive, as its outer shell is closest to the nucleus
- C. The halogen with the largest relative molecular mass is most reactive
- D. Reactivity in Group 7 cannot be predicted from position in the periodic table