Spot the one that does not fit

Exercise and reference answers

Questions

1. Items

   1. Boron
   2. Arsenic
   3. Antimony
   4. Phosphorus

   Odd item

   Boron

2. Items

   1. Bands overlap
   2. Electrons free
   3. Metallic
   4. A gap between

   Odd item

   A gap between

3. Items

   1. Silicon
   2. Germanium
   3. Tetravalent
   4. Trivalent

   Odd item

   Trivalent

4. Items

   1. Doping
   2. Dopants
   3. Extrinsic
   4. Insulator

   Odd item

   Insulator

Instructions

Tap the item that does not belong with the rest.

Explanation