d and f Block ElementshardMCQ SINGLE⭐ Must-Do

According to strict IUPAC periodic table structural definitions, the inner transition elements (the d and f Block Elements Chemistry Question

Question

According to strict IUPAC periodic table structural definitions, the inner transition elements (the f-block) are fundamentally characterized by the progressive, sequential filling of which specific energy subshell?

Answer: C

💡 Solution & Explanation

The hallmark of inner transition metals is that their differentiating electron enters the $f$ -subshell located two principal quantum levels below the outermost valence shell, mathematically designated as the $(n-2)f$ orbital.

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