Lesson T7.2.2

T7.2.2 Predicting reactions from the Periodic Table Quiz: KS3 Chemistry, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson T7.2.2, Predicting reactions from the Periodic Table: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 7: The Periodic Table, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. Why do elements in the same group of the Periodic Table react in similar ways?

    • They have the same colour when they are burned in air
    • They have the same number of outer electrons
    • They have the same density when they are measured as solids
    • They have the same number of neutrons in the nucleus

  2. What happens to the reactivity of Group 1 metals as you go down the group?

    • It stays the same
    • It increases
    • It becomes zero
    • It decreases

  3. What happens to the reactivity of Group 7 halogens as you go down the group?

    • It decreases
    • It stays the same
    • It becomes a metal
    • It increases

  4. Potassium is below sodium in Group 1. How would potassium react with water compared with sodium?

    • Less vigorously than sodium
    • It would react the same as sodium
    • More vigorously than sodium
    • It would not react with water at all

  5. Which halogen is the most reactive?

    • Chlorine
    • Bromine
    • Fluorine
    • Iodine

  6. Which halogen is the least reactive of those listed?

    • Bromine
    • Iodine
    • Fluorine
    • Chlorine

  7. Chlorine displaces bromine from a solution of potassium bromide. What does this show?

    • Chlorine and bromine have equal reactivity
    • Chlorine is more reactive than bromine
    • Potassium bromide is a metal
    • Bromine is more reactive than chlorine

  8. Iodine solution is added to potassium bromide solution and no reaction occurs. What does this show?

    • Iodine is less reactive than bromine
    • Bromine is less reactive than iodine
    • Iodine is more reactive than bromine
    • Iodine is a metal that does not react

  9. Which Period 3 element is most likely to be a good conductor of electricity?

    • Argon
    • Chlorine
    • Phosphorus
    • Magnesium

  10. Which Group 2 element would react most vigorously with water?

    • Magnesium
    • Barium
    • Beryllium
    • Calcium

  11. Based on group trends, which Group 1 metal would be least reactive?

    • Caesium
    • Potassium
    • Lithium
    • Rubidium

  12. Which halogen forms a gas that is coloured greenish-yellow?

    • Astatine, a rare solid at room temperature
    • Chlorine, a greenish-yellow gas at room temperature
    • Iodine, a dark grey solid at room temperature
    • Bromine, a red-brown liquid at room temperature

  13. A student wants to predict whether a metal will react with water. Which information is most useful?

    • The colour of the metal's surface
    • The number of letters in its name
    • The metal's position in its group
    • The date the metal was first named

  14. Which Group 0 element is unreactive and used in light bulbs?

    • Argon
    • Chlorine
    • Oxygen
    • Sodium

  15. Which statement about reactions of Group 1 metals with water is correct?

    • They form a solid metal oxide that sinks, and no gas at all
    • They form an alkaline solution and hydrogen gas
    • They form an acidic solution and give off oxygen gas
    • They form a neutral solution and give off carbon dioxide

  16. Which pattern is seen in the reactions of halogens with metals?

    • Halogens react with metals to form salts
    • Halogens react with metals to form only gases
    • Halogens do not react with any metal
    • Halogens react with metals to form alkalis only

  17. Among lithium, sodium, potassium and calcium, which reacts most vigorously with water?

    • Potassium
    • Lithium
    • Magnesium
    • Calcium

  18. Which Group 2 metal is the most reactive with water?

    • Magnesium
    • Beryllium
    • Barium
    • Calcium

  19. Which Group 7 element is a liquid at room temperature?

    • Iodine
    • Chlorine
    • Bromine
    • Fluorine

  20. Which Group 7 element is a grey-black solid at room temperature?

    • Fluorine
    • Chlorine
    • Iodine
    • Bromine

All KS3 Chemistry quizzes