Question:
The correct electronegativity order among Al, Ga, In, and Tl with respect to Pauling scale is:
The correct electronegativity order among Al, Ga, In, and Tl with respect to Pauling scale is:
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Remember: electronegativity decreases down a group and increases across a period.
Updated On: Jun 19, 2026
- Al > Ga > In > Tl
- Tl > In > Ga > Al
- In > Tl > Ga > Al
- Al > Tl > In > Ga
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The Correct Option is B
Solution and Explanation
Step 1: Understanding electronegativity trend.
Electronegativity generally decreases down a group due to increase in atomic size and shielding effect. Tl (thallium) being the heaviest in group 13 has the lowest electronegativity, while Al has the highest.
Step 2: Apply Pauling scale values.
- Al = 1.61
- Ga = 1.81
- In = 1.78
- Tl = 1.62
Step 3: Correct ordering based on decreasing electronegativity.
The trend observed: Tl > In > Ga > Al.
Step 4: Conclusion.
Hence, option (2) is correct.
Electronegativity generally decreases down a group due to increase in atomic size and shielding effect. Tl (thallium) being the heaviest in group 13 has the lowest electronegativity, while Al has the highest.
Step 2: Apply Pauling scale values.
- Al = 1.61
- Ga = 1.81
- In = 1.78
- Tl = 1.62
Step 3: Correct ordering based on decreasing electronegativity.
The trend observed: Tl > In > Ga > Al.
Step 4: Conclusion.
Hence, option (2) is correct.
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