Discuss the trend of the following
(i) Thermal stability of carbonates of Group 2 elements.
(ii) The solubility and the nature of oxides of Group 2 elements.

Explanation

### Step-by-Step Solution

#### (i) Thermal Stability of Carbonates of Group 2 Elements

1. **Understanding Thermal Stability**: Thermal stability refers to the ability of a compound to resist decomposition when heated. For carbonates, this means how easily they break down into their respective oxides and carbon dioxide upon heating.

2. **Trend in Thermal Stability**: The thermal stability of carbonates in Group 2 elements increases as we move down the group. The order of thermal stability for the carbonates is:
- Beryllium Carbonate (BeCO3) < Magnesium Carbonate (MgCO3) < Calcium Carbonate (CaCO3) < Strontium Carbonate (SrCO3) < Barium Carbonate (BaCO3)
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