Chemistry Transition Elements PMC 2021
PMDC Verified Question 38 of 68
f-Block elements are called
A
Inner transition
B
Both
C
Outer transition
D
None
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Inner transition
Concept:

The periodic table categorizes transition elements based on which subshell is currently being filled with electrons.

Solution:

  • Outer Transition Elements (d-block): These elements are filling the \((n-1)d\) subshell. Because they sit in the main body of the periodic table, they are simply called transition elements.


  • Inner Transition Elements (f-block): These elements are filling the deeper \((n-2)f\) subshell. Because this subshell is "inner" relative to the valence shell and the \(d\)-subshell, the lanthanides and actinides are collectively known as inner transition elements.


Why other options are incorrect:

  • Outer transition refers specifically to the \(d\)-block.

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