The most organised cyrstal system is

Options

A. Orthorhombic
B. Cubic
C. Monoclinic
D. Hexagonal

Answer

To determine the most organized crystal system, we need to analyze the characteristics of the different crystal systems based on their unit cell parameters. Here is a step-by-step solution:

### Step 1: Understand the Crystal Systems
There are several types of crystal systems, each defined by specific parameters related to edge lengths and angles. The main crystal systems are:

1. **Cubic**
2. **Orthorhombic**
3. **Monoclinic**
4. **Hexagonal**

### Step 2: Analyze Each Crystal System

- **Cubic System**:
- Edge lengths (a, b, c) are all equal (a = b = c).
- All angles (α, β, γ) are equal to 90 degrees.

- **Orthorhombic System**:
- Edge lengths are not equal (a ≠ b ≠ c).
- All angles are equal to 90 degrees (α = β = γ = 90°).

- **Monoclinic System**:
- Edge lengths are not equal (a ≠ b ≠ c).
- Two angles are 90 degrees (α = 90°, γ = 90°) and one angle is not (β ≠ 90°).

- **Hexagonal System**:
- Two edge lengths are equal (a = b ≠ c).
- Two angles are 90 degrees (α = 90°, β = 90°) and one angle is 120 degrees (γ = 120°).

### Step 3: Identify the Most Organized System
The most organized crystal system is characterized by having equal edge lengths and equal angles.

- The **Cubic System** is the only system where both edge lengths and angles are equal, making it the most organized of all the crystal systems.

### Conclusion
Based on the analysis, the most organized crystal system is the **Cubic System**.

### Final Answer
**Cubic System**

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