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meo_hallo said:In a crystal net.When i put 2 or many atom nearly.It's electron's energy will become energy band.(view attached image)
why?
what is a essential of this phenonmenon?
Gokul43201 said:When the atoms come close enough for the 2s orbitals to "overlap", the two electrons "become indistiguishable", and can not be identified by labels.
Note: The above is a statement of approximations; hence the quotation (" ") marks.
ewilibrium said:Thank Gokul!
But i think:
If N (~10^23) atom come close, that is not same as your example.
A orbital 2s of one atom can "overlap" with just several other atom. (Not with all atom)
I think that isn't the Identicle Particle in Quantum Mechanics.
I think that is Second Quantization, that is a "representative method"...
ewilibrium said:what electron take what level?
The concept of energy band in solids refers to the energy levels of electrons in a solid material. In a solid, the electrons are confined to a specific energy range, known as the energy band. This band is divided into two types - the valence band, which contains the electrons that are bound to the atoms, and the conduction band, which contains the free electrons that can move throughout the solid.
In conductors, the valence and conduction bands overlap, allowing for easy movement of electrons and thus making them good conductors of electricity. In insulators, there is a large energy gap between the valence and conduction bands, which makes it difficult for electrons to move and thus insulators do not conduct electricity easily. In semiconductors, the energy gap between the two bands is smaller than in insulators, allowing for some electrons to move and making them moderate conductors of electricity.
The essential phenomenon of energy band in solids is the movement of electrons within the energy levels of the band. This movement is what allows for the conduction of electricity in conductors and semiconductors, and the lack of movement is what makes insulators poor conductors.
The energy band structure of a material determines its electrical conductivity and other properties. Materials with a narrow energy band gap, such as semiconductors, can be used in electronic devices, while materials with a wide energy band gap, such as insulators, are used for their insulating properties. The energy band also affects the optical and thermal properties of a material.
Temperature and impurities can affect the energy band structure of a material. An increase in temperature can cause the electrons to gain energy and move to a higher energy level, making the material more conductive. Impurities can introduce energy states within the energy band, affecting the movement of electrons and potentially altering the material's electrical and other properties.