alleryf-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.
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