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For a dopant not to distort the lattice, its atoms must be of nearly the same:

AColour
BCharge
CWeight
DSize
Answer & Solution
Correct answer: D. Size
1. The dopant sits in place of a semiconductor atom. 2. A mismatch would strain the surrounding crystal. 3. So the sizes must be nearly the same. _Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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