4) a) Describe, in detail, why metals are good conductors of electricity. b) How are semiconductors...

4) a) Describe, in detail, why metals are good conductors of electricity.

b) How are semiconductors different from “regular” metals, and how can this be controlled to allow for modern electronics.

Expert Solution

a) In metals, there are free electrons are present which can travel fron one end to the other end of conductor easily.

This free electrons acts as charge carrier and carry the electric current from one end to other end.

For example Copper ( Z = 29) = 1s2 2s2 2p6 3s2 3p6 3d10 4s1

In 4s orbital, one electron is free that acts as charge carrier.

b) There is no need to provide any type of energy to metals to conduct electricity. Semiconductores require the energy( temp ) to conduct electricity. Conductivity of Semiconductors increases with increase in tempereature, this is opposite to that on metal where conductivity decreases with increasing temp.

In modern electronic the semiconductors DOPED with other impuritie. The amount of impurity added is depends upon level of conductivity. By adding impuritie we can made different kinds og semiconductors.

The impurities mainly from 13th & 15 th group elements.

queen_honey_blossom answered 1 year ago

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