Multiple Choice
What particle(s) are found in the center of the atom?
2. Atoms & Elements
Subatomic Particles
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Which two subatomic particles each have a mass approximately equal to one atomic mass unit?
A
Neutron and electron
B
Proton and electron
C
Electron and positron
D
Proton and neutron
Verified step by step guidance1
Understand the concept of atomic mass unit (amu): An atomic mass unit is a standard unit of mass that quantifies mass on an atomic or molecular scale. It is approximately equal to the mass of one nucleon (either a proton or a neutron) and is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state.
Identify the subatomic particles: The main subatomic particles are protons, neutrons, and electrons. Protons and neutrons are found in the nucleus of an atom, while electrons orbit the nucleus.
Compare the masses of these particles: Protons and neutrons have masses that are approximately equal to 1 amu. Electrons, on the other hand, have a much smaller mass, approximately 1/1836 of an amu, which is negligible compared to protons and neutrons.
Evaluate the options given: The options provided are combinations of subatomic particles. We need to identify which pair has masses approximately equal to 1 amu.
Conclude based on the comparison: Since protons and neutrons both have masses close to 1 amu, the correct answer is the pair consisting of a proton and a neutron.
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