The electronic configurations of two metals X and Y are 2, 8, 2 and 2, 8, 8, 2 respectively. What is the effect of the presence of hydrogen carbonate and sulphates of these metals in water?

Explanation

To answer the question regarding the effect of the presence of hydrogen carbonate and sulphates of metals X and Y in water, we can follow these steps:

### Step 1: Identify the Metals
- The electronic configuration of metal X is 2, 8, 2, which corresponds to magnesium (Mg) with atomic number 12.
- The electronic configuration of metal Y is 2, 8, 8, 2, which corresponds to calcium (Ca) with atomic number 20.

### Step 2: Determine the Compounds
- For metal X (magnesium), the relevant compounds are:
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