IIIA group element with highest density is

Options

A. B
B. AI
C. In
D. TI

Answer

To determine which IIIA group element has the highest density, we will analyze the densities of the elements in this group step by step.

### Step-by-Step Solution:

1. **Identify the Elements in the IIIA Group**:
The IIIA group (or Group 13) elements include Boron (B), Aluminium (Al), Gallium (Ga), Indium (In), and Thallium (Tl).

2. **List the Densities of Each Element**:
- Boron (B): 2.35 g/cm³
- Aluminium (Al): 2.70 g/cm³
- Gallium (Ga): 5.90 g/cm³
- Indium (In): 7.31 g/cm³
- Thallium (Tl): 11.85 g/cm³

3. **Compare the Densities**:
- From the listed densities, we can see:
- Boron: 2.35 g/cm³
- Aluminium: 2.70 g/cm³
- Gallium: 5.90 g/cm³
- Indium: 7.31 g/cm³
- Thallium: 11.85 g/cm³

4. **Identify the Element with the Highest Density**:
- As we compare the densities, Thallium (Tl) has the highest density at 11.85 g/cm³.

5. **Conclusion**:
- Therefore, the IIIA group element with the highest density is Thallium (Tl).

### Final Answer:
The IIIA group element with the highest density is **Thallium (Tl)** with a density of **11.85 g/cm³**.

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