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Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
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The band gap between conduction and valence band in metals is:
0 eV
6.0 eV
0.7 eV
1 eV
0 eV
In metals, the valence band and conduction band overlap, meaning there is no forbidden energy gap between them. Consequently, the band gap is considered to be 0 eV, allowing electrons to move freely and conduct electricity at room temperature.
In metals, the valence band and conduction band overlap, meaning there is no forbidden energy gap between them. Consequently, the band gap is considered to be 0 eV, allowing electrons to move freely and conduct electricity at room temperature.
Think of the valence band as a room full of people and the conduction band as a hallway; in metals, the wall between the room and the hallway is missing, allowing people to walk out freely without climbing over anything.
METAL = M (Missing) E (Energy) T (Through) A (Always) L (Low) gap
EgтАЛ=EcтАЛтИТEvтАЛ=0 тАФ where EgтАЛ is the band gap, EcтАЛ is the conduction band energy, and EvтАЛ is the valence band energy.
According to Band Theory in solid-state physics, the electrical properties of a material are determined by the energy bands. In conductors (metals), the valence electrons occupy the highest energy states such that there is no forbidden gap, enabling them to transition into the conduction band without requiring additional thermal energy.
Metals are categorized as conductors due to zero band gap.
Electrons in metals are delocalized, forming an electron sea.
Overlap of bands explains high thermal and electrical conductivity.
High electrical conductivity
Efficient heat transfer
High sensitivity to temperature (resistance increases as temperature rises)
Electrical wiring and circuitry
Heat exchangers
| Feature | Metals (Conductors) | Silicon (Semiconductor) |
|---|---|---|
Band Gap (EgтАЛ) | 0 eV | 1.1 eV |
Option B (6.0 eV) is typical for an insulator like Diamond.
Option C (0.7 eV) is the band gap for Germanium.
Option D (1.1 eV) is the band gap for Silicon at room temperature.
A is correct тАФ In metals, the valence and conduction bands overlap completely, resulting in a forbidden energy gap of 0 eV.
Always remember the order of band gaps: Metals (0 eV) < Semiconductors (~0.5 - 2 eV) < Insulators (> 5 eV).