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Write one similarity and one difference between the chemistry of lanthanoids and that of actinoids.

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**Step-by-Step Solution:** 1. **Identify the Elements**: - Lanthanoids are the elements with atomic numbers 58 to 71 (Ce to Lu). - Actinoids are the elements with atomic numbers 89 to 103 (Ac to Lr). 2. **Determine the Oxidation States**: - Both lanthanoids and actinoids predominantly exhibit a +3 oxidation state in their compounds. This is a key similarity between the two series. ...
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