Monoclinic crystal has dimension

Options

A. `anebnec,alpha=gamma=90^(@),betane90^(@)`
B. `a=b=candalpha=beta=gamma=90^(@)`
C. `a=bnecandalpha=beta=gamma=90^(@)`
D. `anebnecandalphanebetane gammane90^(@)`

Answer

To determine the dimensions of a monoclinic crystal system, we need to understand its defining characteristics in terms of the lengths of its sides and the angles between them.

### Step-by-Step Solution:

1. **Identify the Crystal System**:
- Monoclinic is one of the seven crystal systems in solid-state chemistry.

2. **Understand the Side Lengths**:
- In a monoclinic crystal, the three sides are labeled as A, B, and C.
- The lengths of these sides are different: A ≠ B ≠ C.

3. **Identify the Angles**:
- The angles between the sides are represented as α (alpha), β (beta), and γ (gamma).
- For monoclinic crystals:
- α (angle between sides B and C) = 90°
- β (angle between sides A and C) ≠ 90° (this angle is unique and not right)
- γ (angle between sides A and B) = 90°

4. **Summarize the Dimensions**:
- Therefore, the dimensions of a monoclinic crystal can be summarized as:
- Side lengths: A, B, C (all different)
- Angles: α = 90°, β ≠ 90°, γ = 90°

### Final Answer:
A monoclinic crystal has dimensions where the lengths of the sides are different (A ≠ B ≠ C) and the angles are α = 90°, β ≠ 90°, γ = 90°.

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