Answers

2014-03-09T07:02:00+05:30
Allotropes are the different forms of an element having different physical properties. For example carbon exists in the crystalline allotropes as well as amorphous.
Crystalline form:-  Diamond, graphite and fullerene | Amorphous forms:- coak. sugar charcoal . wood charcoal,  charcoal.Isotopes:- These are the atoms of an element having same atomic number but different atomic mass.
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2014-03-09T09:59:05+05:30
Allotropes are different physical forms of a compound or element where as isotopes are different forms of an atom
eg allotropes - carbon - graphite, diamond
     isotopes  - carbon-12 and carbon-14

the no.of neutrons in isotopes varies 

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