Atomic StructureDeep Dive
Why Are Alkali Metals So Reactive?
Part of Group 1: Alkali Metals — GCSE Chemistry
This deep dive covers Why Are Alkali Metals So Reactive? 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 3 of 12 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 3 of 12
Practice
20 questions
Recall
20 flashcards
🔬 Why Are Alkali Metals So Reactive?
🎯 Understanding this unlocks so many exam questions!
Every alkali metal has just ONE electron in its outer shell. That's the key to everything.
Think of it this way:
- Atoms "want" full outer shells (like noble gases)
- It's easier to lose 1 electron than to gain 7
- So they're desperate to give away that electron!
Why reactivity INCREASES down the group:
- Going down, atoms get bigger (more shells)
- Outer electron is further from the nucleus
- Less attraction = easier to lose = more reactive