Account for the following : (i) `Be(OH)_(2)` is amphoteric while `Mg(OH)_(2)` is basic .

Explanation

To account for why `Be(OH)₂` is amphoteric while `Mg(OH)₂` is basic, we can analyze the properties of beryllium and magnesium hydroxides based on their chemical behavior and the characteristics of the elements involved.

### Step-by-Step Solution:

1. **Understanding Amphoteric and Basic Nature**:
- Amphoteric substances can react with both acids and bases, showing both acidic and basic properties.
- Basic substances can neutralize acids and produce hydroxide ions (OH⁻) in solution.

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