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

Input voltage to system and the output motor speed, A system contains an am...

A system contains an amplifier with a gain of 10 offering the armature voltage for a motor which provides an output speed which is proportional to the armature voltage, the constan

Find the mmf needed to establish a magnetic flux, Q. Consider the toroid sh...

Q. Consider the toroid shown in figure made up of three ferromagnetic materials. Material a is nickel-iron alloy having a mean arc length la of 0.6 m; material b is medium silicon

Electric machinery fundamentals, Ask qu1. If the resistor Radj is adjusted ...

Ask qu1. If the resistor Radj is adjusted to 175O what is the rotational speed of the motor at no-load conditions? 2. Assuming no armature reaction, what is the speed of the motor

Describe binary number system, Q. Describe binary number system? The bi...

Q. Describe binary number system? The binary number system has a base of 2 with two distinct digits (bits), 1 and 0. A binary number is expressed as a string of 0s and 1s, and

Explain properties and application of copper, Explain properties and applic...

Explain properties and application of Copper. Properties 1) Cooper is reddish brown in color. 2) Cooper is malleable and ductile and can be forged, cast, rolled, mach

The programming model of 8085 microprocessor , The  programming  Model of...

The  programming  Model of 8085 Microprocessor The programming  model  of 8085 microprocessor is  shown in figure  below in this  model  various 8 bit  and 16  bit registers a

Explain the hysteresis loop of a magnetic material, Explain the hysteresis ...

Explain the hysteresis loop of a magnetic material. Hystereses loop-Below the Curie temperature all-ferromagnetic materials show the identified hysteresis in the B (i.e. flux

Why hard magnetic materials are used, Hard magnetic materials are used for ...

Hard magnetic materials are used for making (A) Permanent magnets. (C) Conductors. (B) Insulator. (D)Temporary magnets. Ans: Hard magnetic materials are

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