Chemistry Atomic Structure PMC 2021
PMDC Verified Question 69 of 95
\( n+l \) value for \( 5d \) is:
A
\( 5 \)
B
\( 6 \)
C
\( 8 \)
D
\( 7 \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( 7 \)
Concept: The \( (n+l) \) rule is used to determine the relative energy levels of atomic orbitals.

Formula: $$ \text{Value} = n + l $$

Solution:
  • The term "\(5d\)" directly gives us the principal quantum number \( n = 5 \).
  • The letter "\(d\)" corresponds to an azimuthal quantum number \( l = 2 \).
  • Adding them together: \( 5 + 2 = 7 \).


Why other options are incorrect: They result from incorrect memorization of the \(l\) value for the d-subshell (e.g., using \(l=1\) yields 6, which is wrong).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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