The atomic mass of copper is 63.546 amu. Do any copper isotopes have a mass of 63.546 amu? Explain. An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9042 amu. Find the atomic mass of this element and identify it.
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