Why actinides are not affected by nitric acid ?

Explanation

### Step-by-Step Solution:

1. **Understanding Actinides**:
- Actinides are a series of 14 elements in the f-block of the periodic table, ranging from atomic number 90 (thorium) to atomic number 103 (lawrencium). They are known for their radioactive properties and complex chemistry.

2. **Reaction with Nitric Acid**:
- When actinides are exposed to nitric acid (HNO₃), they undergo a chemical reaction. However, unlike many other metals, actinides do not continue to react with nitric acid.

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