# Copper and potassium are both metals. Explain why copper is classed as a transition element but potassium is not, and state two properties that are typical of transition elements.

> Cambridge International IGCSE Chemistry (0620) — 8.4 Transition elements · Explain · 4 marks

## Mark scheme (4 marks)

1. Copper is in the d-block / middle section of the periodic table, whereas potassium is in Group I / s-block
2. Transition elements form coloured compounds / ions
3. Transition elements can act as catalysts
4. Transition elements form ions with variable / different oxidation states

## Key terms

- [transition element](https://www.gradenine.co.uk/glossary/transition-element)

## Related

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Source: [GradeNine](https://www.gradenine.co.uk/q/copper-and-potassium-are-both-metals-206bb124) · Published by Druglandscape Ltd.