Ncert Exercises & Solutions

The correct statements among the following about metals are-

I.	Valence band overlaps with the conduction band.
II.	The gap between the valence band and conduction band is negligible
III.	The gap between the valence band and conduction band cannot be determined
IV.	Valence band may remain partially filled

1. (I, II, III)

2. (II, III, IV)

3. (I, III, IV)

4. (I, II, IV)

Hint: In metals, the valence band overlaps with the conduction band.

In metals, the valence band is partially filled or it overlaps with a higher energy unoccupied conduction band, hence electrons can flow easily under an applied electric field and the metal shows conductivity.

Hence, option fourth is the correct answer.

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