How many elements are alkali metals ?
How many elments are alkali metals ?
Magnesium, sodium, potassium, aluminium, silicon, lithium

Explanation

To determine how many elements are alkali metals from the given list (Magnesium, Sodium, Potassium, Aluminium, Silicon, Lithium), we will follow these steps:

### Step 1: Identify the Group of Each Element
- Alkali metals are found in Group 1 of the periodic table.
- We will check the group of each element listed.

### Step 2: Analyze Each Element
1. **Magnesium (Mg)**:
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