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Atomic StructureIntroduction

The Metals That Hate Water

Part of Group 1: Alkali Metals — GCSE Chemistry

This introduction covers The Metals That Hate Water within Group 1: Alkali Metals for GCSE Chemistry. Revise Group 1: Alkali Metals 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 1 of 12 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 12

Practice

20 questions

Recall

20 flashcards

📖 The Metals That Hate Water

Most metals just sit there when you drop them in water. But drop a piece of sodium in a bowl of water and WHOOSH — it fizzes, darts across the surface, and might even burst into flames! Potassium is even more dramatic: it instantly ignites with a beautiful lilac flame. These are the alkali metals — the most reactive metals on the periodic table. They're so desperate to lose that one outer electron that they'll react with almost anything. Your school probably keeps them under oil because they'd react with the moisture in the air!
🏀 The Hot Potato Analogy

Alkali metals hold their outer electron like a hot potato — they can't wait to get rid of it! With only 1 electron in their outer shell, they just need to lose it to have a full shell underneath. The bigger the atom (going down the group), the further away that electron sits, and the weaker the grip. Potassium's outer electron is like a hot potato held at arm's length — it practically throws itself away!

Keep building this topic

Read this section alongside the surrounding pages in Group 1: Alkali Metals. That gives you the full topic sequence instead of a single isolated revision point.

Group 1 Alkali MetalsWhy Are Alkali Metals So Reactive?Why Reactivity Increases Down Group 1

Practice Questions for Group 1: Alkali Metals

How many electrons do alkali metals have in their outermost shell?

  • A. 1
  • B. 2
  • C. 7
  • D. 8
1 markfoundation

Explain why potassium is more reactive than sodium when it reacts with water.

3 marksstandard

Quick Recall Flashcards

More reactive: Li or K?
Potassium (further down = more reactive)
Equation: sodium + water →
2Na + 2H₂O → 2NaOH + H₂

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