Chemical property of Li and Mg are similar because

Options

A. These belong to same group
B. Both ionisation potential is same
C. Shows diagonal relationship
D. Both electron affinity is same

Answer

To answer the question about why the chemical properties of Lithium (Li) and Magnesium (Mg) are similar, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Identify the Position of Lithium and Magnesium in the Periodic Table**:
- Lithium (Li) is located in Group 1 (Alkali Metals) and Period 2.
- Magnesium (Mg) is located in Group 2 (Alkaline Earth Metals) and Period 3.

2. **Understand the Concept of Diagonal Relationship**:
- The diagonal relationship in the periodic table refers to the similarity in properties between elements that are diagonally positioned relative to each other. In this case, Li and Mg exhibit similar chemical properties due to their positions.

3. **Examine the Similarities in Chemical Properties**:
- Both Li and Mg have similar atomic structures, which leads to comparable reactivity and bonding characteristics. For example, both can form similar types of compounds (like oxides and hydroxides) and exhibit similar behavior in reactions with water.

4. **Consider the Electron Configuration**:
- Lithium has an electron configuration of 1s² 2s¹, while Magnesium has an electron configuration of 1s² 2s² 2p⁶ 3s². The presence of the s-electrons in both elements contributes to their similar reactivity.

5. **Conclusion**:
- The chemical properties of Li and Mg are similar primarily due to their diagonal relationship in the periodic table, which results from their comparable atomic structure and electron configurations.

### Final Answer:
The chemical properties of Lithium (Li) and Magnesium (Mg) are similar because they exhibit a diagonal relationship in the periodic table, leading to comparable atomic structures and similar reactivity.

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