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  2. Neutron - Wikipedia

    en.wikipedia.org/wiki/Neutron

    The neutron is a subatomic particle, symbol n or n 0, that has no electric charge, and a mass slightly greater than that of a proton.Protons and neutrons constitute the nuclei of atoms.

  3. Atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Atomic_nucleus

    Protons define the entire charge of a nucleus, and hence its chemical identity. Neutrons are electrically neutral, but contribute to the mass of a nucleus to nearly the same extent as the protons. Neutrons can explain the phenomenon of isotopes (same atomic number with different atomic mass). The main role of neutrons is to reduce electrostatic ...

  4. Rutherford model - Wikipedia

    en.wikipedia.org/wiki/Rutherford_model

    Much of an atom's positive charge is concentrated in a relatively tiny volume at the center of the atom, known today as the nucleus. The magnitude of this charge is proportional to (up to a charge number that can be approximately half of) the atom's atomic mass—the remaining mass is now known to be mostly attributed to neutrons.

  5. Subatomic particle - Wikipedia

    en.wikipedia.org/wiki/Subatomic_particle

    Neutrons are neutral particles having a mass slightly greater than that of the proton. Different isotopes of the same element contain the same number of protons but different numbers of neutrons. The mass number of an isotope is the total number of nucleons (neutrons and protons collectively).

  6. Discovery of the neutron - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_the_neutron

    A schematic of the nucleus of an atom indicating β − radiation, the emission of a fast electron from the nucleus (the accompanying antineutrino is omitted). In the Rutherford model for the nucleus, a red sphere was a proton with positive charge, and a blue sphere was a proton tightly bound to an electron, with no net charge.

  7. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    There are two types of quarks in atoms, each having a fractional electric charge. Protons are composed of two up quarks (each with charge + ⁠ 2 / 3 ⁠) and one down quark (with a charge of − ⁠ 1 / 3 ⁠). Neutrons consist of one up quark and two down quarks. This distinction accounts for the difference in mass and charge between the two ...

  8. Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number

    The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of its atomic nucleus. For ordinary nuclei composed of protons and neutrons , this is equal to the proton number ( n p ) or the number of protons found in the nucleus of every atom of that element.

  9. Nucleon - Wikipedia

    en.wikipedia.org/wiki/Nucleon

    The proton carries a positive net charge, and the neutron carries a zero net charge; the proton's mass is only about 0.13% less than the neutron's. Thus, they can be viewed as two states of the same nucleon, and together form an isospin doublet (I = ⁠ 1 / 2 ⁠). In isospin space, neutrons can be transformed into protons and conversely by SU ...