Multiple Choice
Which subatomic particle surrounds the nucleus and is negatively charged?
2. Atoms & Elements
Subatomic Particles
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Which subatomic particles contribute the most to the mass of an atom?
A
Protons and neutrons
B
Neutrons and electrons
C
Electrons
D
Protons and electrons
Verified step by step guidance1
Understand the structure of an atom: An atom consists of a nucleus containing protons and neutrons, surrounded by electrons.
Recognize the relative masses of subatomic particles: Protons and neutrons have significantly more mass compared to electrons. The mass of a proton is approximately 1.67 × 10-27 kg, and the mass of a neutron is similar, while the mass of an electron is about 9.11 × 10-31 kg.
Consider the contribution of each particle to the atomic mass: Since protons and neutrons are much heavier than electrons, they contribute the most to the mass of an atom.
Evaluate the options given: Compare the mass contributions of protons, neutrons, and electrons to determine which particles contribute the most to the atomic mass.
Conclude based on the analysis: Protons and neutrons, being the heaviest subatomic particles, are responsible for the majority of an atom's mass.
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