An element consists of two isotopes and has an average atomic weight of 85.561 a.m.u. The abundance of one isotope is 73.907% and its atomic mass is 84.9117 a.m.u. What is the atomic mass of the second isotope, in a.m.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.