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It refers to the energy levels in an atom where the electrons that participate in bonding occupy. These energy levels correspond to those of the s and p orbitals of the outermost shell of the atom being considered.
Wiki User
∙ 10y ago
Wiki User
∙ 13y agoThe outer most shell in an atom is the valence band. It has the shared electrons. They interact with the rest of the atoms and energy exchanges.
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What are applications of direct and indirect band gap?
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and in indirect band gap the band electron falls from the conduction band to valance band by first going through the metastable state
What is the gap between valance band and conduction band in a semi conductor?
Conduction band - The unfilled energy levels into which electrons can be excited to provide conductivity.Valence band - The energy levels filled by electrons in their lowest energy states.
Why are metals thermally conductive?
Because metals are the good conductors of current. the conduction band and the valance band are overlap on each other,so when the current passes from the metal because of overlapping on both the bands current passes easily.
Why do the semiconductors have negative temperature coefficient whereas the metals have positive values?
Semiconductors: When temperature increases, more electrons jump to conduction band from valance bond. Hence resistance decreases. Metals: Already plenty of electrons are there in conduction band. When temperature increases, the electrons in conduction band of metal vibrate and collide each other during their journey. Hence the the resistance of metal increases with increase of temperature. S.Lakshminarayana
What is fermi level?
the highest energy level which an electron can occupy the valance band at 0k is called fermi energy level
What is energy gap?
there will be only certain energy levels in which electrons get filled up. In valence orbitals there will be many such energy levels and the energy gap between conduction band and valence band is called energy band gap.
Why acceptor energy level is near to valence band in p-type semiconductor?
valance band has lower energy level
Why silicon has more barrier potential than germanium?
Due to variation in energy gap between valance band and conduction band....
What is the connection between Fermi Level and Electronic Grade Materials?
fermi level:- This is the level of energy that lies in the forbiddan gap. It is the level of energy where the concentration of electrons in conduction band is equal to the concentration of holes in valance band. Since in intrinsic semiconductor the probability of electrons in conduction band is equal to the holes in valance band therefore lies exactly in the middle of fforbiddan gap In case of extrinsic semiconductor material, that depends what sort of dopping is there. If the donar impurity is there, it will shift towards conduction band, and if there is acceptor impurity it will shift towards valance band.
What are applications of direct and indirect band gap?
direct band gap means in e-k diagram valance bands are exactly below covalance band,in this band electron falls from the conduction band to valance band directly without going to metastable state and in indirect band gap the band electron falls from the conduction band to valance band by first going through the metastable state
Why does oxygen and sulfur electron configuration form similar molecules?
Same "fullness" of the valance band.
What materials can be classified as conductor?
* Any element where the valence band of electrons overlap the conductance band is called conductors * The band gap between the Valance bond and conductance band is very low * Electrons are more in Conductance band
Why is a rubber band an insulator?
The electron configuration of rubber (natural of artificial is such that there is a big gap between valance band and conduction band of electrons. Electrons has to make a transition from valence band to conduction band in order to conduct electricity.
What is a difference between forbidden energy gap depletion region in semiconductor?
forbidden energy gap or energy gap or band gap or band or Eg is the gap between the top of the valance band and bottom of the conduction band. If we apply the energy equivalent to Eg then the electrons in valance band will jump to the conduction band. Ravinder kumar meena stpi n depletion region is the region in semiconductor where there is depletion of free charge carriers.Ravinder kumar meena stpi n
Why is rubber a good electrical insulator?
The electron configuration of rubber (natural of artificial is such that there is a big gap between valance band and conduction band of electrons. Electrons has to make a transition from valence band to conduction band in order to conduct electricity.
Is foam a good conducter of heat?
In a foam there is a large gap between the conduction band and the valence of band in the atoms makng up the foam. If any object is to conduct electricity through it the gap between the conduction band amd the valance should be minimun or overlapping so that the electrons in the valance band can go into conduction band and conduct electricity
Is silicon a direct band gap material?
Silicon is by all means an indirect band gap material.
