This memory aid covers Memory Aids within Group 1: Alkali Metals for GCSE Chemistry. Revise Group 1: Alkali Metals in Atomic Structure for GCSE Chemistry with 22 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 9 of 13 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
🧠 Memory Aids
"LiNaK RbCs Fr" — Li-Na-K-Rb-Cs-Fr — the Group 1 elements in order. "Little Naughty Kids Roam Cities Freely" helps recall: Lithium, Sodium (Na), Potassium (K), Rubidium, Caesium, Francium.
Reactivity trend: "Bigger = Looser = More Reactive" — as atoms get bigger down the group, the outer electron is held more loosely, so the element is more reactive.
Water reaction product: "Alkali metal + Water = HOH (metal Hydroxide + Hydrogen)" — always produces a hydroxide and hydrogen gas.
Quick Check: Explain why potassium is more reactive than lithium when reacting with water.
Potassium has more electron shells than lithium, so its outer electron is further from the nucleus. There is also greater electron shielding. This means the electrostatic attraction between the nucleus and the outer electron is weaker, so the electron is lost more easily, making potassium more reactive.
Practice questions for Group 1: Alkali Metals
How many electrons do alkali metals have in their outermost shell?
Explain why potassium is more reactive than sodium when it reacts with water.