Answer:Cu, Ag, and Au are all in the group number11Explanation:To answer this question you must look at yourperiodic table.The elements in the periodic table are ordered in increasing order ofatomic numberand elements with similarchemical properties, due to the same number of valence eletrons, lay in the same column.Thecolumnin the periodic table corresponds to the chemical group, and,  in the most modern version, is identified with a number1 through 18.The elments Cu (copper), Ag (silver), and Au (gold), all metals, are in the same group (column) number 11.The elements in the columns 3 trough 12 aretransition metals. The atomic numbers of thise elements, which let you to find them easily in your periodic table, are:Cu: 29 (it is the first element in the group)Ag: 47 (it is directly below Cu)Au: 79 (79 ( it is directly below Ag)Those elements, along with platinum are paladium, are the metals with thelowest reactivity, which is the reason why they are found in nature in its pure form (not combined with other elements)....

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