Silicon is widely used in the semiconductor industry. Its isotopes and abundance are: Si-28 (27.977 amu & 92.34%), Si-29 (28.977 amu & 4.70%), and Si-30 (29.974 amu & 2.96%). What is the average atomic mass of silicon?

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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.