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UNIT1.THEATOM,CONDUCTORS,SEMICONDUCTORS
ANDINSULATORS
I.
Pre-reading
Checkthemeaningofthewordsbelow
andfindthreeexamplesofchemical
elements,threeexamplesofparticles
andthreeexamplesofadjectives
balanced
charged
conductor
copper
current
electron
germanium
helium
hydrogen
insulator
neutron
nucleus
outermost
particle
proton
randomly
II.Reading
Fig.1.1.Bohr'smodelofanatom
retain
semiconductor
shell
silver
tightly
uncharged
whereas
wool
A.Readthetextaboutthestructureofanatomandthepropertiesof
materialsandthencompletetheblankswiththeappropriate
sentences.Thereisoneextrasentenceyoudonotneedtouse
a.Coilsareusedtostoreenergyinelectromagneticfield.
b.Protonsarepositivelychargedparticles,electronsarenegatively
charged.
c.Thelastshell,theonewhichisoutermosthasoneelectron.
d.Therefore,theydonotcarrycurrentsoeasily.
e.Typicalexamplesofinsulatorsarewood,glassandceramic.
Anatomisthesmallestparticleofanelementthatretainsits
characteristics.Itconsistsofanucleusinthemiddleandelectronswhich
