Donor impurity has 5 valence electrons (while silicon has 4 valence electrons). Hence donor impurity can donate electrons.
The number of valence electrons in donor impurity are
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Question context
This question is part of 📡 Electronics and Communication Engineering (ECE) within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.