Considering the elements `B, Al, Mg` and `K`, the correct order of their metallic character is

Options

A. `B gt Al gt Mg gt K`
B. `Al gt K gt B gt Mg`
C. `Mg gt Al gt K gt B`
D. `K gt Mg gt Al gt B`

Answer

To determine the correct order of metallic character for the elements B (Boron), Al (Aluminum), Mg (Magnesium), and K (Potassium), we need to consider their positions in the periodic table and the trends in metallic character.

### Step-by-Step Solution:

1. **Identify the Position of Each Element:**
- Boron (B) is in Group 13 (IIIA) and Period 2.
- Aluminum (Al) is in Group 13 (IIIA) and Period 3.
- Magnesium (Mg) is in Group 2 (IIA) and Period 3.
- Potassium (K) is in Group 1 (IA) and Period 4.

2. **Understand the Trend of Metallic Character:**
- Metallic character increases as you move down a group in the periodic table.
- Metallic character decreases as you move from left to right across a period.

3. **Analyze the Elements:**
- **Potassium (K)** is in Period 4 and is a Group 1 element, making it highly metallic.
- **Magnesium (Mg)** is in Period 3 and is a Group 2 element, which is also metallic but less so than potassium.
- **Aluminum (Al)** is in Period 3 and is in Group 13, which is less metallic than magnesium.
- **Boron (B)** is in Period 2 and is a metalloid, making it the least metallic among these elements.

4. **Order the Elements Based on Metallic Character:**
- From the analysis, we can conclude the order of metallic character:
- Potassium (K) > Magnesium (Mg) > Aluminum (Al) > Boron (B)

5. **Final Answer:**
- The correct order of metallic character is: **K > Mg > Al > B**