Correct Answer:<\/strong> c) an electron<\/p>\n\n\n\n The correct answer is an electron<\/strong>. When comparing the fundamental components of an atom and the composite alpha particle, the electron possesses a significantly smaller mass than all other options.<\/p>\n\n\n\n An atom is primarily composed of three fundamental subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found clustered together in the atom’s central core, the nucleus. Due to their location and similar, substantial masses, they are collectively known as nucleons. A proton has a mass of approximately 1.672 x 10\u207b\u00b2\u2077 kilograms (kg), and a neutron is slightly heavier, with a mass of about 1.674 x 10\u207b\u00b2\u2077 kg. For simplicity, both are often assigned a relative mass of 1 atomic mass unit (amu).<\/p>\n\n\n\n In stark contrast, the electron is an extremely lightweight particle that orbits the nucleus. Its mass is only about 9.109 x 10\u207b\u00b3\u00b9 kg. This is roughly 1\/1836th the mass of a proton. Because its mass is so insignificant compared to that of protons and neutrons, it is often considered negligible when calculating an atom’s total mass number.<\/p>\n\n\n\n The fourth option, an alpha particle, is not a fundamental subatomic particle. It is a composite particle, specifically the nucleus of a helium atom, consisting of two protons and two neutrons bound together. Consequently, its mass is the sum of its components, making it approximately four times more massive than a single proton or neutron and the most massive particle on the list.<\/p>\n\n\n\n Therefore, arranging the particles from most massive to least massive gives the following order: alpha particle > neutron > proton > electron. The electron is, by a very large margin, the particle with the smallest mass.<\/p>\n\n\n\n Which subatomic particle has the smallest mass? a neutron proton an electron an alpha particle The Correct Answer and Explanation is: Correct Answer: c) an electron Explanation: The correct answer is an electron. When comparing the fundamental components of an atom and the composite alpha particle, the electron possesses a significantly smaller mass than all other options. 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