An unknown element (Uk) has three isotopes, seen in the table. One of the percentage values is missing. Percent Isotope Notation Mass (amu) Abundance (%) Uk-66 65.994 57.00 Uk-69 68.958 13.00 Uk-71 70.975 ? Once you have found the missing percentage, calculate the average atomic mass of Uk. Enter your answer to the hundredths place.

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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.