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- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2040%3A_General_Physics_III/10%3A_Nuclear_Physics_and_Radioactivity/10.1%3A_The_NucleusNuclear size is defined by nuclear radius; nuclear density can be calculated from nuclear size.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/05%3A_Radiation_and_Spectra/5.05%3A_The_Structure_of_the_AtomAtoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nuc...Atoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nucleus. The number of protons defines an element (hydrogen has one proton, helium has two, and so on) of the atom. Nuclei with the same number of protons but different numbers of neutrons are different isotopes of the same element.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/05%3A_Radiation_and_Spectra/5.04%3A_The_Structure_of_the_AtomAtoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nuc...Atoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nucleus. The number of protons defines an element (hydrogen has one proton, helium has two, and so on) of the atom. Nuclei with the same number of protons but different numbers of neutrons are different isotopes 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/Joliet_Junior_College/PHYS202_-_JJC_-_Testing/01%3A_Conceptual_Objective_1/1.01%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/17%3A_Electric_Charge_and_Field/17.1%3A_OverviewAtoms contain negatively charged electrons and positively charged protons; the number of each determines the atom’s net charge.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/29%3A_Atomic_Physics/29.2%3A_The_Early_AtomModern scientific usage denotes the atom as composed of constituent particles: the electron, the proton and the neutron.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/13%3A_Comets_and_Asteroids_-_Debris_of_the_Solar_System/13.03%3A_The_Long-Haired_CometsHalley first showed that some comets are on closed orbits and return periodically to swing around the Sun. The heart of a comet is its nucleus, a few kilometers in diameter and composed of volatiles a...Halley first showed that some comets are on closed orbits and return periodically to swing around the Sun. The heart of a comet is its nucleus, a few kilometers in diameter and composed of volatiles and solids. Whipple first suggested this “dirty snowball” model in 1950; it has been confirmed by spacecraft studies of several comets. As the nucleus approaches the Sun, its volatiles evaporate (perhaps in localized jets or explosions) to form the comet’s head or atmosphere.
- 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/15.04%3A_The_Structure_of_the_AtomAtoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nuc...Atoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nucleus. The number of protons defines an element (hydrogen has one proton, helium has two, and so on) of the atom. Nuclei with the same number of protons but different numbers of neutrons are different isotopes of the same element.
- 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/3.2.04%3A_The_Structure_of_the_AtomAtoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nuc...Atoms consist of a nucleus containing one or more positively charged protons. All atoms except hydrogen can also contain one or more neutrons in the nucleus. Negatively charged electrons orbit the nucleus. The number of protons defines an element (hydrogen has one proton, helium has two, and so on) of the atom. Nuclei with the same number of protons but different numbers of neutrons are different isotopes of the same element.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/30%3A_Nuclear_Physics_and_Radioactivity/30.1%3A_The_NucleusNuclear size is defined by nuclear radius; nuclear density can be calculated from nuclear size.
