Chromium (average atomic mass 5 51.9961 amu) has four isotopes. Their masses are 49.94605 amu, 51.94051 amu, 52.94065 amu, and 53.93888 amu. The first two isotopes have a total abundance of 87.87%, and the last isotope has an abundance of 2.365%. What is the abundance of the third isotope? Estimate the abundances of the first two isotopes.
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