Chemistry / Chem 0282 · Atom · ~20 seconds
Main-Group, Transition, and Inner Transition Elements
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Main-group elements occupy columns 1, 2, and 13–18; transition metals fill the columns between; inner transition metals form two bottom rows.
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Iron sits among the transition metals in period 4, while cerium sits in the lanthanide row below the table's main body.
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Group 12 is often called a transition-metal column out of habit, though IUPAC's own definition excludes it from that category.