Name the element
A trivalent metal used to make light tools.

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Type of Metal:**
- The question specifies a "trivalent metal." Trivalent metals are those that can exhibit a valency of +3, meaning they can lose three electrons.

2. **Determine the Element:**
- One of the most common trivalent metals is aluminum. It is known for its trivalence due to its ability to lose three electrons from its outer shell.

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