Calculate the atomic weight of silicon on the basis of the following percent composition and atomic weights of the naturally occurring isotopes. Compare the calculated value with the atomic weight listed for silicon in the periodic table   Silicon-28 = 92.21% (27.9769 u)   Silicon-29 = 4.70% (28.9765 u)  Silicon-30 = 3.09% (29.9738 u)

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.