This category covers the actinoid series, comparing their properties with lanthanoids. It includes electronic configurations, trends, and key differences to help students prepare for chemistry exams.
Strong metallic bonding due to involvement of d-electrons in bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cerium (Ce) shows +4 state to achieve stable 4f 0 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cu + has 3d 10 configuration with all paired electrons, making it diamagnetic.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Tungsten (W) has the highest enthalpy of atomization in the 5d series due to strong metallic bonding.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cr 2 O 7 2− + 14H + + 6e − → 2Cr 3+ + 7H 2 O (E° = +1.33 V).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cerium (Ce) shows +4 state to achieve stable 4f 0 configuration (like Xenon).
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.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Eu 2+ (Europium) has a stable half-filled f 7 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Cr 2 O 7 2- + 6Fe 2+ + 14H + → 2Cr 3+ + 6Fe 3+ + 7H 2 O
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Transition metal complexes are typically colored due to d-d transitions.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids
Uranium (U) shows +6 oxidation state in compounds like UF 6 and UO 2 2+ .
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
