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Which statement best describes an electron?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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In a typical atom, which subatomic particle has the least mass?
A
Proton
B
Neutron
C
Electron
D
Alpha particle
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Recall the three main subatomic particles found in an atom: protons, neutrons, and electrons.
Understand that protons and neutrons are located in the nucleus and have masses close to 1 atomic mass unit (amu) each.
Recognize that electrons orbit the nucleus and have a much smaller mass compared to protons and neutrons, approximately 1/1836 of a proton's mass.
Note that an alpha particle consists of 2 protons and 2 neutrons, so its mass is even greater than that of a single proton or neutron.
Conclude that among the listed options, the electron has the least mass.
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