+The **4f** electron shell defines a specific energy level and complex shape for electrons within an atom. It is prominently filled across the [Lanthanides](/wiki/Lanthanides) series, imparting unique [Magnetic Properties](/wiki/Magnetic_Properties) and rich spectral characteristics to these elements.
+## See also
+- [Electron Shell](/wiki/Electron_Shell)
+- [f-block](/wiki/f-block)
+- [Quantum Number](/wiki/Quantum_Number)
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