Give two example of pentavalent and trivalent impurities

Explanation

To answer the question regarding examples of pentavalent and trivalent impurities, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Trivalent Impurities**: These are elements that have three valence electrons. When added to a semiconductor, they create "holes" (positive charge carriers).
- **Pentavalent Impurities**: These are elements that have five valence electrons. When added to a semiconductor, they provide extra electrons (negative charge carriers).

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