Which metals do not corrode casily?

Explanation

**Step-by-Step Solution:**

1. **Understanding Corrosion**: Corrosion is the process where metals react with environmental elements (like oxygen and moisture) and deteriorate over time. Some metals corrode easily, while others do not.

2. **Reactivity Series**: Metals are arranged in a reactivity series based on their reactivity. The reactivity series ranks metals from most reactive to least reactive. Metals at the bottom of this series are less reactive and, therefore, do not corrode easily.

3. **Identifying Non-Corrosive Metals**: The metals that are located at the bottom of the reactivity series include:
- **Gold (Au)**: Gold is highly resistant to corrosion and tarnishing.
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