Conductor and Semicondustor.

Explanation

`{:("Conductor","Semiconductor"),("1. A substance which conducts heat and electricity to a greater extent is called conductor.","1. A substance which has poor electrical conductance at low temperature but higher conductance at higher temperature is called semiconductor."),("2. In this, conduction bands and valence bands overlap or are very closely spaced.","2. In this, conduction bands and valence bands are spaced closely."),("3. There is no energy difference or very less energy difference between valence bands and conduction bands.","3. Then energy difference between conduction bands and valence bands is small."),("4. There are free electrons in the conduction bands.","4. The electrons can be easily excited from valence bands to conduction bands by heating."),("5. The conductance decreases with the increase in temperature.","5. Coductance increases with the increase in temperature."):}`