One isotope has an atomic weight of 408.5 atm and a percent abundance of 23.0% while the other isotope has an atomic weight of 414.3.  What is the weighted atomic weight of the element in atm?

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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.