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  2. Atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Atomic_nucleus

    Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force. The diameter of the nucleus is in the range of 1.70 fm (1.70 × 10 −15 m [7]) for hydrogen (the diameter of a single proton) to about 11.7 fm for ...

  3. Mass number - Wikipedia

    en.wikipedia.org/wiki/Mass_number

    For other isotopes, the isotopic mass is usually within 0.1 u of the mass number. For example, 35 Cl (17 protons and 18 neutrons) has a mass number of 35 and an isotopic mass of 34.96885. [7] The difference of the actual isotopic mass minus the mass number of an atom is known as the mass excess, [8] which for 35 Cl is –0.03115.

  4. Shape of the atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_atomic_nucleus

    The atomic nucleus is composed of protons and neutrons (collectively called nucleons). In the Standard model of particle physics, nucleons are in the group called hadrons, the smallest known particles in the universe to have measurable size and shape. [1] Each is in turn composed of three quarks.

  5. For All This Time, Protons Have Been Hiding Secret Mass ... - AOL

    www.aol.com/lifestyle/time-protons-hiding-secret...

    Physicists have long known that protons are more massive than the stuff that makes them up, but we didn’t know where that mass was located. Now we do. For All This Time, Protons Have Been Hiding ...

  6. Proton - Wikipedia

    en.wikipedia.org/wiki/Proton

    A proton is a stable subatomic particle, symbol p, H +, or 1 H + with a positive electric charge of +1 e (elementary charge).Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio).

  7. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    If an atom has more electrons than protons, then it has an overall negative charge and is called a negative ion (or anion). Conversely, if it has more protons than electrons, it has a positive charge and is called a positive ion (or cation). The electrons of an atom are attracted to the protons in an atomic nucleus by the electromagnetic force.

  8. 14 Marvel Quizzes Anyone With Free Time Should Take - AOL

    www.aol.com/news/14-mcu-quizzes-instead...

    Lighter Side. Medicare. News

  9. Valley of stability - Wikipedia

    en.wikipedia.org/wiki/Valley_of_stability

    Stable nuclides require approximately equal numbers of protons and neutrons. The stable nuclide carbon-12 (12 C) is composed of six neutrons and six protons, for example. Protons have a positive charge, hence within a nuclide with many protons there are large repulsive forces between protons arising from the Coulomb force. By acting to separate ...