Question

what is forbidden energy gap ?​

Answer 1

$\huge\bold\star{\underline{\underline{\mathcal\purple{Nmste}}}}\star$

$<b>$The separation between valence band and conduction band is known as forbidden energy gap.

If an electron is to be transfered from valence band to conduction band, external energy is required, which is equal to the forbidden energy gap.

▌│█║▌║▌║▌│█║▌║▌║♥️

Answer 2

The portion of the energy band structure of a semiconductor or insulator between the valence and conduction bands.

i.e., electrons within the solid may not possess these energies. The band theory accounts for many of the electrical and thermal properties of solids and forms the basis of the technology of solid-state electronics.