Explain how materials can be classified in three groups, Electrical Engineering

Assignment Help:

Explain how materials can be classified into three groups on the basis of atomic structure.

An atom has a positively charged nucleus surrounded through a group of negatively charged electrons. This nucleus is at the centre of the atom and electrons are established in definite states, energy-levels and orbits. The electrons in the outermost orbit of an atom are termed as valence electrons. This is these electrons which are responsible for finding the physical, electrical and chemical properties of the material.

The materials are classified on the basis of atomic structure:

1) When the number of valence electrons of an atom is less than 4 that is half of maximum permissible 8 electrons, the material is a conductor or metal. Illustration Cu, Al and Mg have 1, 2 and 3 valence electrons correspondingly.

 2) When the number of valence electrons of an atom is more than 4, the material is an insulator. Illustration, Se and Bromine consist of 5, 6 and 7 valence electrons correspondingly.

3) When the number of valence electrons of an atom is 4 that are exactly half of maximum permissible 8 electrons, therefore the material is a semiconductor. Illustration Carbon, Silicon and Germanium consist of 4 valence electrons each.


Related Discussions:- Explain how materials can be classified in three groups

For which type of measurement thermocouples are used, Thermocouples are use...

Thermocouples are used for the measurement of (A)  Humidity.                                   (B) Pressure. (C) Temperature.                               (D) Density.

Speed control of dc motor using pid, The objective of the project is to pro...

The objective of the project is to protect damage of the DC motors. If the motor is not working it will be shown with red light, if working normally then green and if working at a

DLD, draw alogic diagramto implement F=ABCDE using only 3 inputAND gates

draw alogic diagramto implement F=ABCDE using only 3 inputAND gates

Explain junction transistors (npn and pnp), Explain junction transistors (n...

Explain junction transistors (npn and pnp). Junction Transistor: This transistor consists of two p-n junctions combined in one crystal as demonstrated in figure below.

Explain the block diagrtam of d.c. voltmeter , Q.   Explain the block diagr...

Q.   Explain the block diagrtam of D.C. voltmeter with direct coupled amplifier. Sol. D.C, voltmeter with direct coupled Amplifier         The D.C. electronic voltmeters

Measuring with an oscilloscope, 1. Introduction : Theory:   The ...

1. Introduction : Theory:   The voltage measured across a load follows the Ohm's law which says that the current passing through a conductor between two points is direct

Explain the different types of multivibrators, Explain the different types ...

Explain the different types of multivibrators ? Multivibrator is basically  a two-stage amplifier with output of one supplied back to the input of the other . Multivibr

Static v- i characteristics - power semiconductor devices, V- I Characteris...

V- I Characteristics The operation of the  diac can be explained by imagining it as two diodes connected  in series. When  applied voltage in either polarity is small ( less t

Explain the term simplex transmission, Explain the term simplex transmissio...

Explain the term simplex transmission. Data in a simplex channel is always one method. Simplex channels are not frequently used because this is not possible to send back error

Laplace transform method, Consider the circuit shown in Figure (a) in which...

Consider the circuit shown in Figure (a) in which the switch S has been in position 1 for a long time. Let the switch be changed instantaneously to position 2 at t = 0. Obtain v(t)

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd