28. Why is iron (Fe) regarded as a transition metal?
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Answer:Iron is regarded as transition metal because it has variable valencies.
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The 38 elements in groups 3 through 12 of the periodic table are called "transition metals". As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat. ... These elements are iron, cobalt, and nickel, and they are the only elements known to produce a magnetic field.
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