Element having highest atomic radius among the following is :

Options

A. Li
B. Be
C. B
D. C

Explanation

To determine which element has the highest atomic radius among the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements**: First, we need to identify the elements provided in the question. For the sake of this solution, let’s assume the elements are Lithium (Li), Beryllium (Be), Boron (B), and Carbon (C).

2. **Understand Atomic Radius Trends**: In the periodic table, atomic radius generally decreases as you move from left to right across a period. This is due to the increase in the effective nuclear charge (Z-effective) as protons are added to the nucleus, pulling the electrons closer and reducing the size of the atom.

3. **Analyze the Elements**:
- Lithium (Li) is in Group 1 and has the largest atomic radius among the elements in the second period.
- Beryllium (Be) is in Group 2 and has a smaller atomic radius than Lithium.
- Boron (B) is in Group 13 and has an even smaller atomic radius than Beryllium.
- Carbon (C) is in Group 14 and has the smallest atomic radius among these four elements.

4. **Conclusion**: Since Lithium has the largest atomic radius due to its position in the periodic table, we conclude that the element with the highest atomic radius among the given options is **Lithium (Li)**.

### Final Answer:
The element having the highest atomic radius among the following is **Lithium (Li)**.

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