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A minimum energy is required for an electron for jumping from valence band to conduction band, i.e two bands are seperated in terms of energy. No electrons can reside within this energy gap. That's why this band gap is called forbidden energy gap.
Answer

The electrons can reside in valence band or conduction band. The electron can be moved from valence band to conduction band when enegry is supplied to then.So this band gap is called forbidden energy gap.

Answer

The Energy band gap is known as the Forbidden energy gap simply because there are no electrons residing there apart from the Conduction and Valence Bands.

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According to energy band theory of solids an electron can reside only in two bands of allowed energy states. Either in valance band or in conduction band. No any other allowed energy states in between these two bands. So this gap in between the bands is called 'forbidden gap'
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As no electron in that particular material can have energy between lower value and higher value of band gap, it is known as forbidden gap
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Forbidden as no electrons can have energy in the gap ;a quantum mechanical effect.

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