Q. 41

Which of the following statements are true about metals?
A. Valence band overlaps with conduction band.

B. The gap between valence band and conduction band is negligible.

C. The gap between valence band and conduction band cannot be determined.

D. Valence band may remain partially filled.

Answer :

Metals conduct electricity through the movement of electrons in solid as well as molten state. The conductivity is dependent on the number of valence electrons. Electrical conductivity of a substance depends on the ability of the solid to flow electrons from the valence band to a conduction band. In a crystal lattice, the atomic orbitals of the atoms overlap and form molecular orbitals with very close values in energy, and form a band. A partially filled valence or an overlapping valence band are featured in metals. The band gap, even if negligible can be determined in metals using UV-Vis spectrometry. Options (i), (ii) and (iv) are correct.

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