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Which statement correctly describes protons and neutrons?
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2. Atoms & Elements
Subatomic Particles
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Which of the following subatomic particles has the smallest mass?
A
Neutron
B
Alpha particle
C
Electron
D
Proton
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Recall the basic subatomic particles and their relative masses: electron, proton, neutron, and alpha particle (which is a helium nucleus).
Understand that the electron is a fundamental particle with a very small mass compared to nucleons (protons and neutrons).
Note that protons and neutrons have masses close to 1 atomic mass unit (amu), while electrons have a mass approximately 1/1836 of a proton.
Recognize that an alpha particle consists of 2 protons and 2 neutrons, so its mass is roughly 4 amu, much larger than a single proton or neutron.
Conclude that among the given options, the electron has the smallest mass because it is much lighter than protons, neutrons, and alpha particles.
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