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The f block elements consist of the lanthanides and actinides. The lanthanides fill the antepenultimate 4f energy levels and have similar properties. Their electrons typically occupy the 4f levels, though some occupy 5d levels for stability. They have a uniform +3 oxidation state and form ionic compounds as trivalent ions. The actinides are also f block elements but the 5f and 6d energy levels are similar for the first four actinides, allowing electrons to occupy both. Later actinides follow the lanthanide
- Author
- Afaf Hucyn
- Language
- EN