Question

Energy gaps between the highest filled band and the lowest empty bands in elements $A,B,C$ and $D$ are $0,70,530$ and $110kJmo{l}^{-1}$. Thus,

• A. element A is metal
• B. element C is insulator
• C. element B and D can be semiconductors
• D. all are correct conclusion about elements $A,B,C$ and $D$

Answer 1

The correct option is D all are correct conclusion about elements $A,B,C$ and $D$

Very less energy gap in A means that electrons can easily jump between bands. This makes it a metal (conductor.) Similarly, the large gap in C means C is an insulator. On the other hand, a moderate gap makes B and D semiconductors.

Hence, the correct option is $\text{D}$