Some of the most important metals we use are found in the transition element section of the Periodic Table. One of these elements is copper. Sodium, a Group I metal, has very different properties from those of copper. Complete the table below to show their differences.

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Transition element, Group I metal, e.g. sodium e.g. copper Hardness (hard/soft) Reactivity Density (high/low) Catalytic activity Variable oxidation states