The alkaline earth metal which shows coordination number four in its complexes is …….. .

Explanation

To solve the question regarding which alkaline earth metal shows a coordination number of four in its complexes, we can follow these steps:

### Step 1: Identify Alkaline Earth Metals
The alkaline earth metals belong to Group 2 of the periodic table. The elements in this group are:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
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