# Rubidium is a Group I metal. Describe what is observed when a small piece of rubidium is placed on the surface of water.

> Cambridge International IGCSE Chemistry (0620) — 8.2 Group I properties · Describe · 4 marks

## Mark scheme (4 marks)

1. Rubidium moves/floats on the surface of the water
2. Effervescence / bubbles of gas are produced
3. The rubidium ignites / catches fire / burns with a flame
4. The rubidium disappears / dissolves / is completely used up

## Key terms

- [Group I](https://www.gradenine.co.uk/glossary/group-i)

## Related

- [Revision notes for Cambridge International IGCSE Chemistry (0620)](https://www.gradenine.co.uk/learn)
- [How to answer "Describe" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
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Source: [GradeNine](https://www.gradenine.co.uk/q/rubidium-is-a-group-i-metal-8f25753b) · Published by Druglandscape Ltd.