Chemistry Atomic Structure BUMHS 2022
PMDC Verified Question 58 of 95
What is the electronic configuration of C?
A
\( 1s^2, 2s^2, 2p^2 \)
B
\( 1s^2, 2s^2, 2p^4 \)
C
\( 1s^2, 2s^2, 2p^6, 3s^2 \)
D
\( 1s^2, 2s^2, 2p^6, 3s^2, 3p^3 \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \( 1s^2, 2s^2, 2p^2 \)
Concept: The electronic configuration is built by sequentially filling atomic orbitals according to the Aufbau principle until all electrons are placed.

Formula: None required.

Solution:
  • Carbon (C) has an atomic number \( Z = 6 \).
  • Therefore, a neutral Carbon atom possesses exactly 6 electrons.
  • Fill the \( 1s \) orbital: 2 electrons \( \implies 1s^2 \) (4 remaining).
  • Fill the \( 2s \) orbital: 2 electrons \( \implies 2s^2 \) (2 remaining).
  • Place the remaining 2 electrons into the \( 2p \) orbital \( \implies 2p^2 \).
  • Total configuration: \( 1s^2, 2s^2, 2p^2 \).


Why other options are incorrect: Option B is Oxygen (8). Option C is Magnesium (12). Option D is Phosphorus (15).

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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