What is valence band ?

What do you mean by valence band, conduction band and forbidden gap?

Fill ups If there is a large energy gap between the filled valence band and empty conduction band, the subtance acts as …………….. .

The highest energy level, which an electron can occupy in the valence band at OK is called (i)forbidden gap (ii) fermi-level (Tick the correct option)

Explain the formation of energy bands in solids and hence define conduction band and valence band.

The lowest unfilled energy band formed just above the valence band is called conduction band. (True/false)

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)_C , (Eg)_Si and (Eg)_ Ge . Which of the following statements is true?

What are energy bands? Explain the formation of energy bands in case of silicon crystal.