Europium has two naturally occurring isotopes: Eu-151 with a mass of 150.9198 amu and a natural abundance of 47.81 %%, and Eu-153. a.) Use the atomic mass of europium to find the mass of Eu-153. Express your answer in atomic mass units to four significant figures.   b.) Find the natural abundance of Eu-153.   Express your answer in percent to four significant figures.

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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.