What are immobile mineral elements ? Name them.

Explanation

**Step-by-Step Solution:**

1. **Understanding Immobile Mineral Elements**:
- Immobile mineral elements are those that do not move or have very limited mobility within the plant. This means once they are absorbed by the plant, they tend to stay in the tissues where they are utilized.

2. **Definition of Immobility**:
- The term "immobile" refers to the inability to move from one location to another. In the context of plants, it means that these mineral elements remain in the specific tissues where they are needed for various physiological processes.

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