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Unit1.Theatom,conductors,semiconductorsandinsulators
III.Vocabulary
11
A.Freeelectronsandions.Fillinwiththewordsfromthetable.There
aretwoextrawordsthatyoudonotneedtouse
breakatomion
shellgets
energycurrent
can
Whenanelectronintheouter---
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-ofthecopperatom
---
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-enoughenergyfromthesurroundingmedia,itcan---
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-
awayfromtheparentatomandbecomeafreeelectron.Thefreeelectronsin
thecoppermaterial---
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--movefromoneatomtoanotherinthe
material.Inotherwords,theydriftrandomlyfromatomto---
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withinthecopper.Thefreeelectronsmakeelectrical----
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-possible.
B.Definitions.Readthedefinitionsanddecidewhattheydescribe
1.Thesmallestparticleofanelementthatretainsitscharacteristics.
2.Apositivelychargedparticle.
3.Thepositivelychargedcentralpartofanatom,composedofprotons
andneutrons.
4.Asubstancethatconductsheat,light,sound,orespeciallyanelectric
charge.
5.Anelectronintheoutermostshellofanatom.
6.Asubstancethatstopstheflowofcurrent,heat,lightorsound.
C.Decidewhichworddoesnotbelongtothecategoryandsaywhy
1.copper,rubber,glass,polythene
2.proton,neutron,electron,insulator
3.randomly,loosely,tiny,poorly
4.silicon,woolen,silver,copper
5.rod,conduct,flow,letpassthrough
D.Antonyms.Matchthewordsthathaveoppositemeanings
carrycurrent
charged
fewer
former
less
positive
more
lose
uncharged
negative
loosely
latter
