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Lanthanoid contraction is the gradual decrease in atomic/ionic radii across the lanthanoid series.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
Actinoids exhibit variable oxidation states due to comparable energies of 5f, 6d, and 7s orbitals.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Actinoids are all radioactive, contrary to the incorrect option.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Neptunium (Np) and Plutonium (Pu) can show +7 oxidation state, though it is rare.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Actinium (Ac) shows only the +3 oxidation state, similar to lanthanum.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Actinoids exhibit variable oxidation states due to comparable energies of 5f, 6d, and 7s orbitals, allowing participation of multiple electrons in bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
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