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Explanation:The form AZX denoted that;Z = The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element.A = Mass Number ( Sum of Neutrons and Protons)X represents the element.A. the copper isotope with 34 neutronsX = CuAtomic Number of Copper, Z = 29Mass Number, A = 29 + 34 = 6363.29.CuB. the copper isotope with 36 neutronsX = CuAtomic Number of Copper, Z = 29Mass Number, A = 29 + 36 = 6565.29.CuC. the potassium isotope with 21 neutronsX = KAtomic Number of Potassium, Z = 19Mass Number, A = 19 + 21 = 4040.19.KD. the argon isotope with 22 neutronsX = ArAtomic Number of Argon, Z = 18Mass Number, A = 18 + 22 = 4040.18.Ar...