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Free Electron Theory:
This theory tells that, metals conduct electricity because of the presence of free electrons in it. The outermost shells of metal atoms will be loosely bound with their nucleus. So the electrons in it are free to move anywhere in the solid.These electrons are called free electrons and they are responsible for the conduction of electricity.
Band theory of solids:
A solid is assumed to contain many bands in which the electrons in it are packed. The most important are valence band and conduction band. The energy of electrons in these bands will be different.The difference in energies of valence band and conduction band determines whether the solid is a conductor, semi - conductor or insulator.For insulators, the difference between energies of them ( energy gap ) will be very high, and for conductor, these bands overlap each other.
The conduction band carries the electrons that conduct electricity, but the valence band has all the electrons in the ground state. Whether they go into the conduction band depends on the temperature and the energy gap between the bands. In a conductor, these bands overlap, and hence many electrons can become conducting. Thus, Band Theory explains distinction between metals and insulators, which Free Electron theory cannot do (since it assumes all valence electrons become conducting). Calculations are be performed to see which materials will have big energy gaps and which will have overlapping bands.
What else can I help you with?
Why the classical theory of solids cannot explain the theory of solids?
The classical theory of solids is based on the assumption that atoms are fixed in a lattice structure and do not move. However, quantum mechanics shows that atoms in solids have wave-like properties and do exhibit movement. This discrepancy between classical theory and quantum mechanics makes classical theory inadequate for explaining the behavior of solids at the atomic level.
Which is the weakest bond in solids?
Van der Waals bond is typically the weakest bond in solids. It arises due to temporary fluctuations in electron distribution that result in weak attractive forces between molecules or atoms.
What is the difference between a crystaline mineral and an amorphous mineral?
because amorphous solids are that solids that don't have geometrical shape and don't have particular melting point but crystalline solids have characterstic geometrical shape and have sharp melting point.
The kinetic theory helps to explain the differences between?
The kinetic theory helps to explain the differences between solids, liquids, and gases by describing the movement and behavior of particles in each state. In solids, particles are tightly packed and vibrate in fixed positions. In liquids, particles are more spread out and can move around but are still close together. In gases, particles are far apart and move freely.
What is multi electron system?
A multi-electron system refers to a system that involves more than one electron interacting with each other. These systems are commonly found in atoms, molecules, and solids, where the behavior and properties are influenced by the interactions between multiple electrons. Understanding multi-electron systems is crucial in fields like quantum mechanics and condensed matter physics.
What is the difference between clarifier and classifier?
Clarifier removes solids from Liquid and Clarifier removes solids from Gas
Why the classical theory of solids cannot explain the theory of solids?
The classical theory of solids is based on the assumption that atoms are fixed in a lattice structure and do not move. However, quantum mechanics shows that atoms in solids have wave-like properties and do exhibit movement. This discrepancy between classical theory and quantum mechanics makes classical theory inadequate for explaining the behavior of solids at the atomic level.
What is the paticle theory?
The particle theory provides a model to help us understand the differences between fluids and solids.
What has the author Karl-Fredrik Berggren written?
Karl-Fredrik Berggren has written: 'Effects of electron structure and correlation on equations of state of solids' -- subject(s): Electronic structure, Energy-band theory of solids
What is difference between valence band theory and crystal field theory?
Valence band theory describes the electronic structure of solids based on the energy levels of electrons in the valence band of the material. On the other hand, crystal field theory focuses on the interaction between the d-orbitals of transition metal ions and the surrounding ligands, which results in the splitting of d-orbitals into different energy levels.
How do you distinguish between a regular solid and an irregular solid?
Regular solids have all sides the same, irregular solids have different sides.
What solids made of?
Particles. Just like liquids and gases. The difference between them is that solids have tighter packed particles that are less able to move freely
Which is the weakest bond in solids?
Van der Waals bond is typically the weakest bond in solids. It arises due to temporary fluctuations in electron distribution that result in weak attractive forces between molecules or atoms.
What is the difference between a crystaline mineral and an amorphous mineral?
because amorphous solids are that solids that don't have geometrical shape and don't have particular melting point but crystalline solids have characterstic geometrical shape and have sharp melting point.
What is the difference between a geometric solid than a polyhedron?
A polyhedron is in a subclass of geometric solids. The difference is that a polyhedron must have flat faces and straight edges.
What is the difference between solid shapes and solids?
there is no difference because a solid shape is a solid because its solid as if in hard so there is no difference. if you want you can still look it up on google or something. !
What is the difference between a solid and a liquid volume?
Solids and liquids both have definite volumes. Gasses, however, do not have a definite volume.
