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  • https://chem.libretexts.org/Bookshelves/General_Chemistry/ChemPRIME_(Moore_et_al.)/04%3A_The_Structure_of_Atoms/4.11%3A_Atomic_Structure_and_Isotopes
    The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usua...The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usually about half the number of units of mass because about half the nuclear particles are uncharged neutrons. The number of neutrons can be obtained by subtracting the number of protons (Z) from the total number of particles in the nucleus (A):
  • https://chem.libretexts.org/Courses/Oregon_Institute_of_Technology/OIT%3A_CHE_101_-_Introduction_to_General_Chemistry/02%3A_Atoms_and_the_Periodic_Table/2.07%3A_Unit_2_Practice_Problems
    Practice problems with solutions for unit 2 including atomic structure, periodic table, and electron configurations.
  • https://chem.libretexts.org/Courses/Hope_College/CHEM_125/Exam_I/03%3A_The_Structure_of_Atoms/3.11%3A_Atomic_Structure_and_Isotopes
    The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usua...The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usually about half the number of units of mass because about half the nuclear particles are uncharged neutrons. The number of neutrons can be obtained by subtracting the number of protons (Z) from the total number of particles in the nucleus (A):
  • https://chem.libretexts.org/Courses/Duke_University/CHEM_210D%3A_Modern_Applications_of_Chemistry/3%3A_Textbook-_Modern_Applications_of_Chemistry/02%3A_Nuclear_Chemistry/2.03%3A_Atomic_Structure_and_Isotopes
    The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usua...The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usually about half the number of units of mass because about half the nuclear particles are uncharged neutrons. The number of neutrons can be obtained by subtracting the number of protons (Z) from the total number of particles in the nucleus (A):
  • https://chem.libretexts.org/Courses/Bennington_College/Chemistry_-_An_Integrated_Approach_(Bullock)/03%3A_Why_Do_Molecules_Exist/3.02%3A_Atomic_Structure
    [8] The radius of a “typical” atom is on the order of about 1×10 -10 m, whereas that of the nucleus is about 1×10 -15 m; using this proportion, if an atom were the size of a football field, 100 yards ...[8] The radius of a “typical” atom is on the order of about 1×10 -10 m, whereas that of the nucleus is about 1×10 -15 m; using this proportion, if an atom were the size of a football field, 100 yards across, the nucleus would be like a dime sitting on the 50-yard line; the rest of the surrounding stadium would be the electron cloud.
  • https://chem.libretexts.org/Courses/University_of_North_Texas/UNT%3A_CHEM_1410_-_General_Chemistry_for_Science_Majors_I/Text/04%3A_The_Structure_of_Atoms/4.11%3A_Atomic_Structure_and_Isotopes
    The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usua...The proton carries a charge of +e, has a mass about the same as a hydrogen atom, and is found within the very small volume of the nucleus. The number of units of positive charge on the nucleus is usually about half the number of units of mass because about half the nuclear particles are uncharged neutrons. The number of neutrons can be obtained by subtracting the number of protons (Z) from the total number of particles in the nucleus (A):

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