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A material behaves as a metal when the two bands:

AOverlap
BVanish
CWiden
DInvert
Answer & Solution
Correct answer: A. Overlap
1. No energy is needed to reach the upper band if it starts lower. 2. Electrons then move freely without crossing any gap. 3. That happens when the bands overlap. 4. So the answer is overlap. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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