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.
please explain
the difference between crystalline solids and amorphous solids are that particles in crystalline solids form a regular repeating pattern but in amorphous solids they are not arranged in a regular shapeCrystals are solids with fixed, regularpatterns
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.
use an electric circuit and see if it is a conductor.
A crystal is a solid that has a definite, regular structure in its atoms, molecules, or ions. Not all solids are like this.
Clarifier removes solids from Liquid and Clarifier removes solids from Gas
The particle theory provides a model to help us understand the differences between fluids and solids.
please explain
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
the difference between crystalline solids and amorphous solids are that particles in crystalline solids form a regular repeating pattern but in amorphous solids they are not arranged in a regular shapeCrystals are solids with fixed, regularpatterns
Solids have the lowers and gases the highest kinetic energy. Liquids are in the middle.
Regular solids have all sides the same, irregular solids have different sides.
Particles. Just like liquids and gases. The difference between them is that solids have tighter packed particles that are less able to move freely
Regular object have equla sides and irregular dont
fluids move and are liquids, soldids are hard and and is like a dresser or something
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.
total dissolved solids is how much of the solid is dissolved in the liquid, while suspended total suspended solids is the amount of the solid floating in the liquid. e.g. if you had a solution with both and you filtered the solution then evaporated out the liquid, the solids that you filtered out would be the suspended solids, and the the solids remaining after evaporating the liquid out would be the disolved solids.