atoms and molecules

Asked by sciencekida | 28th Mar, 2008, 01:19: PM

Expert Answer:

An atom is single and smallest unit of exsistence of an element.In nature thses atoms exist not alone but in groups of one,two or three or more atoms together. These groups are chemically called molecules.Like oxygen exists as O2 that is two atoms together.

Answered by  | 3rd Apr, 2008, 08:38: PM

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