Answers

2014-09-19T20:30:07+05:30
Element : robert boyle defined element as any substance that cannot be decomposed into further simple substance by a physical or chemical change 

example: hydrogen.helium etc..,

Compound : a thing that is composed of two or more separate elements; a mixture.
 
example: Nacl,etc..,
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2014-09-19T20:31:38+05:30
Element - a particle which cannot be broken into simplier substances physically or chemically is called an element.
ex - oxygen,hydrogen etc..
compound - a combination of 2 or more elements or compounds is called a compound.
ex-
  2H₂+O₂⇒2H₂O

Zn+2HCl⇒ZnCl₂+H₂.
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