Which of the following is NOT a good conductor of electricity?

Bromine

The correct answer is option 3. Bromine.

The substance that is NOT a good conductor of electricity is Bromine.

Bromine is a non-metal and does not conduct electricity well. It is in the liquid state at room temperature and is primarily used in organic synthesis, flame retardants, and other industrial applications, but it does not exhibit electrical conductivity like metals or graphite.