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  2. Atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Atomic_nucleus

    These dimensions are much smaller than the diameter of the atom itself (nucleus + electron cloud), by a factor of about 26,634 (uranium atomic radius is about 156 pm (156 × 10 −12 m)) [9] to about 60,250 (hydrogen atomic radius is about 52.92 pm). [a]

  3. Atomic radii of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Atomic_radii_of_the...

    For more recent data on covalent radii see Covalent radius. Just as atomic units are given in terms of the atomic mass unit (approximately the proton mass), the physically appropriate unit of length here is the Bohr radius, which is the radius of a hydrogen atom. The Bohr radius is consequently known as the "atomic unit of length".

  4. Atomic radius - Wikipedia

    en.wikipedia.org/wiki/Atomic_radius

    Therefore, the radius of an atom is more than 10,000 times the radius of its nucleus (1–10 fm), [2] and less than 1/1000 of the wavelength of visible light (400–700 nm). The approximate shape of a molecule of ethanol, CH 3 CH 2 OH. Each atom is modeled by a sphere with the element's Van der Waals radius. For many purposes, atoms can be ...

  5. Shape of the atomic nucleus - Wikipedia

    en.wikipedia.org/wiki/Shape_of_the_atomic_nucleus

    If the nucleus is assumed to be spherically symmetric, an approximate relationship between nuclear radius and mass number arises above A=40 from the formula R=R o A 1/3 with R o = 1.2 ± 0.2 fm. [6] R is the predicted spherical nuclear radius, A is the mass number, and R o is a constant determined by experimental data.

  6. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    All the bound protons and neutrons in an atom make up a tiny atomic nucleus, and are collectively called nucleons. The radius of a nucleus is approximately equal to femtometres, where is the total number of nucleons. [42]

  7. Charge radius - Wikipedia

    en.wikipedia.org/wiki/Charge_radius

    The problem of defining a radius for the atomic nucleus has some similarity to that of defining a radius for the entire atom; neither has well defined boundaries.However, basic liquid drop models of the nucleus imagine a fairly uniform density of nucleons, theoretically giving a more recognizable surface to a nucleus than an atom, the latter being composed of highly diffuse electron clouds ...

  8. Nuclear density - Wikipedia

    en.wikipedia.org/wiki/Nuclear_density

    The components of an atom and of a nucleus have varying densities. The proton is not a fundamental particle, being composed of quark–gluon matter. Its size is approximately 10 −15 meters and its density 10 18 kg/m 3. The descriptive term nuclear density is also applied to situations where similarly high densities occur, such as within ...

  9. Bohr radius - Wikipedia

    en.wikipedia.org/wiki/Bohr_radius

    The Bohr radius (⁠ ⁠) is a physical constant, approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. Its value is 5.291 772 105 44 (82) × 10 −11 m. [1] [2]