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Which element has the most metallic character?

1. Boron
2. Aluminium
3. Indium
4. Thallium

Correct answer: Aluminium

Solution

Metallic character generally increases down a group, but in Group 13 the trend is not perfectly smooth. Aluminium is the most metallic here because boron is a metalloid, and indium and thallium are affected by stronger inert-pair effects that reduce their expected metallic behavior.

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