INTRODUCTION;-IN ORDER TO EXPLAIN the phenomena associated with conduction in gases , metal and semiconductors . it is necessary to assume that the atom has loosely bound electrons which can be dislodged form it .
The most fundamental unit of solid can be consider to be an atom . hence the study of the atomic
structure is important .
- ATOMIC STRUCTURE :-
Every material is made up of one or more element . an element being a substance composed entiring of atom of the same kind ,for instance , water is combined of the elements hydrogen and oxygen . whereas common salt is a combination of the element sodium and chlorine .
- SOME IMPORTENT CHARACTESTICS ASSOCIATED WITH ATOMS ARE :-
1) an atom contains a central massive core called nucleus carrying a positive charge .
2) negative charge electron revolve around the nucleus in circular orbit .
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