Chemistry Atomic Structure NUMS 2022
PMDC Verified Question 63 of 95
The mass of electron is:
A
\( 1836 \) times more than mass of proton
B
\( 1836 \) times less than mass of proton
C
\( 1836 \) times more than mass of neutron
D
\( 1836 \) time more than mass of hydrogen atom
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 1836 \) times less than mass of proton
Concept: The electron is a fundamental lepton, carrying an incredibly tiny mass compared to the nucleons (protons and neutrons) that make up the atomic core.

Formula: $$ \frac{m_p}{m_e} \approx 1836 $$

Solution:
  • The absolute rest mass of a proton is approximately \( 1.672 \times 10^{-27} \text{ kg} \).
  • The rest mass of an electron is approximately \( 9.109 \times 10^{-31} \text{ kg} \).
  • Dividing the two yields a ratio of roughly 1836.
  • This means a single proton is 1836 times heavier than an electron, or conversely, an electron is 1836 times lighter (less massive) than a proton.


Why other options are incorrect: Saying the electron is "more" massive than a proton, neutron, or whole hydrogen atom is factually backwards.

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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