which two subatomic particles contribute mass?
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Only protons and neutrons contribute to an atom's mass value. For atoms (neutral species), the number of electrons is equivalent to the number of protons.
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The particles in the standard model can be put into two groups: fermions and bosons. Fermions are the building blocks of matter. They all obey the Pauli exclusion principle. Bosons are force-carriers.
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The subatomic particle with the largest mass is the neutron.
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Protons and neutrons, each with masses of approximately one atomic mass unit, are collectively referred to as "nucleons" (particles present in atomic nuclei). One or more protons are present in the nucleus of every atom; they are a necessary part of the nucleus.
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Particles that are smaller than the atom are called subatomic particles. The three main subatomic particles that form an atom are protons, neutrons, and electrons. The center of the atom is called the nucleus.
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Subatomic particles are typically located in two places; the protons and neutrons are in the nucleus at the center of the atom, whilst the electrons...
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Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."
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Quarks. Quarks represent the smallest known subatomic particles. These building blocks of matter are considered the new elementary particles, replacing protons, neutrons and electrons as the fundamental particles of the universe.
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, with no electric charge and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons.
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Compare the three subatomic particles in terms of location in the atom, mass, and relative charge. Electrons surround the nucleus and have a negative charge and small mass relative to protons and neutrons. Most of an atom's mass is in its nucleus, which is the center and composed of protons and neutrons.
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The nucleus of an atom normally contains two types of particle: the proton and the neutron. From what you have learned before, it may seem that protons and neutrons are fundamental particles. This would be a nice simple picture of matter: three particles that make up the Universe - protons, neutrons and electrons.
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Careful measurements have shown that the mass of a particular atom is always slightly less than the sum of the masses of the individual neutrons, protons, and electrons of which the atom consists. The difference between the mass of the atom and the sum of the masses of its parts is called the mass defect (Δm).
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The model suggests that atoms are made of smaller subatomic particles. In the middle of every atom is the nucleus. The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge.
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Protons, neutrons, and electrons are the three main subatomic particles found in an atom.
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With regard to mass, protons and neutrons are very similar, and have a much greater mass than electrons. Compared with neutrons and protons, the mass of an electron is usually negligible.
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Even though electrons, protons, and neutrons are all types of subatomic particles, they are not all the same size. ... On the other hand, the masses of protons and neutrons are fairly similar, although technically, the mass of a neutron is slightly larger than the mass of a proton.
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Originally Answered: Which subatomic particle contributes to the majority of the mass number of an atom? Protons and neutrons are within 1% of each other in mass, both being about 1000 times more massive than electrons.