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- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/03%3A_Atomic_Theory_and_Periodic_Table/3.02%3A_Atoms_and_the_Periodic_Table/3.2.07%3A_Atomic_Mass_and_Atomic_NumberAtoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be e...Atoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be equal to the number of negatively charged electrons. Since neutrons do not affect the charge, the number of neutrons is not dependent on the number of protons and will vary even among atoms of the same element.
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/31%3A_Radioactivity_and_Nuclear_Physics/31.03%3A_Substructure_of_the_NucleusWhat is inside the nucleus? Why are some nuclei stable while others decay? Why are there different types of decay ( α , β and γ )? Why are nuclear decay energies so large? Pursuing natural questio...What is inside the nucleus? Why are some nuclei stable while others decay? Why are there different types of decay ( α , β and γ )? Why are nuclear decay energies so large? Pursuing natural questions like these has led to far more fundamental discoveries than you might imagine.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/03%3A_Atomic_Theory_and_Periodic_Table/3.02%3A_Atoms_and_the_Periodic_Table/3.2.08%3A_IsotopesIsotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have...Isotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have synthetic isotopic forms that have been made by nuclear chemists and/or physicists. Chemically, isotopes appear to be the same. For example, the two most abundant forms of uranium look physically the same and react to other materials in a similar manner.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/12%3A__Nuclear_Physics/12.02%3A_Properties_of_NucleiThe atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These partic...The atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These particles are packed together into an extremely small space at the center of an atom. According to scattering experiments, the nucleus is spherical or ellipsoidal in shape, and about 1/100,000th the size of a hydrogen atom. Protons and neutrons within the nucleus are called nucleons.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/10%3A__Nuclear_Physics/10.02%3A_Properties_of_NucleiThe atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These partic...The atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These particles are packed together into an extremely small space at the center of an atom. According to scattering experiments, the nucleus is spherical or ellipsoidal in shape, and about 1/100,000th the size of a hydrogen atom. Protons and neutrons within the nucleus are called nucleons.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_II_(2212)/12%3A__Nuclear_Physics/12.01%3A_Properties_of_NucleiFor large values of \(Z\), the number of neutrons is greater than the number of protons \((N > P)\) and the data points fall above the red line. The mass of an individual nucleus is often expressed in...For large values of \(Z\), the number of neutrons is greater than the number of protons \((N > P)\) and the data points fall above the red line. The mass of an individual nucleus is often expressed in atomic mass units (u), where \(u = 1.66054 \times 10^{-27} kg\). (An atomic mass unit is defined as 1/12th the mass of a \(^{12}C\) nucleus.) In atomic mass units, the mass of a helium nucleus (A = 4) is approximately 4 u.
- https://phys.libretexts.org/Courses/Fresno_City_College/NATSCI-1A%3A_Natural_Science_for_Educators_Fresno_City_College_(CID%3A_PHYS_140)/15%3A_Atomic_Theory_and_Periodic_Table/15.06%3A_Atomic_Mass_and_Atomic_NumberAtoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be e...Atoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be equal to the number of negatively charged electrons. Since neutrons do not affect the charge, the number of neutrons is not dependent on the number of protons and will vary even among atoms of the same element.
- https://phys.libretexts.org/Courses/Fresno_City_College/NATSCI-1A%3A_Natural_Science_for_Educators_Fresno_City_College_(CID%3A_PHYS_140)/15%3A_Atomic_Theory_and_Periodic_Table/15.07%3A_IsotopesIsotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have...Isotopes are atoms of the same element that differ in the amount of neutrons and atomic mass. Almost all elements on the periodic table have at least two different natural isotopes. Many elements have synthetic isotopic forms that have been made by nuclear chemists and/or physicists. Chemically, isotopes appear to be the same. For example, the two most abundant forms of uranium look physically the same and react to other materials in a similar manner.
- https://phys.libretexts.org/Courses/Bowdoin_College/Phys1140%3A_Introductory_Physics_II%3A_Part_2/07%3A__Nuclear_Physics/7.02%3A_Properties_of_NucleiThe atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These partic...The atomic nucleus is composed of protons and neutrons. Protons and neutrons have approximately the same mass, but protons carry one unit of positive charge and neutrons carry no charge. These particles are packed together into an extremely small space at the center of an atom. According to scattering experiments, the nucleus is spherical or ellipsoidal in shape, and about 1/100,000th the size of a hydrogen atom. Protons and neutrons within the nucleus are called nucleons.
