f-block elements include:
ANoble gases
BLanthanides (4f¹⁻¹⁴) and Actinides (5f¹⁻¹⁴)
CHalogens
DSc, Y
Answer & Solution
Correct answer: B. Lanthanides (4f¹⁻¹⁴) and Actinides (5f¹⁻¹⁴)
f-block: Inner transition elements. Lanthanides (La/Ce-Lu): 4f filling. Actinides (Ac/Th-Lr): 5f filling. Generally placed at bottom of periodic table for compactness.
Related questions
Magnetic susceptibility of Fe³⁺ vs Fe²⁺ in high-spin complexes:Why is Sc³⁺ colorless?Eu²⁺ is more stable than other Ln²⁺ because:Number of unpaired electrons in [Mn(CN)₆]³⁻ (Mn(III), d⁴, strong field CN⁻):Magnetic moment of [Fe(H₂O)₆]³⁺ (Fe³⁺ is d⁵, weak field H₂O → high spin):Oxidation state of Cu in [Cu(NH₃)₄]²⁺:Coordination number of Ag in [Ag(CN)₂]⁻:K₂Cr₂O₇ (potassium dichromate) is a strong: