Iron, cobalt, and nickel are similar in properties and are sometimes studied together as the iron triad.
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Iron, cobalt, and nickel are similar in properties and are sometimes studied together as the “iron triad.” For example, each is a fairly active metal that reacts with acids to give hydrogen and the +2 ions. In addition to the +2 ions, the +3 ions of the metals also figure prominently in the chemistries of the elements. Explain why these elements are similar.
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