5005 Praxis Practice Test Practice Question
Of the following, which is the smallest particle in an atom?
Correct Answer: B
Rationale: Electrons are the smallest particles in an atom, with a mass approximately 1/1836 that of a proton or neutron. Protons and neutrons, found in the nucleus, are significantly larger and more massive.
Protons (Option A) and neutrons (Option C) are both baryons, composed of quarks, and have similar masses, making them much larger than electrons. The nucleus (Option D) is a collection of protons and neutrons, thus it is also larger than individual electrons. Understanding these distinctions is crucial for grasping atomic structure and the fundamental nature of matter.
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