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  2. Silicon - Wikipedia

    en.wikipedia.org/wiki/Silicon

    Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, ... The known isotopes of silicon range in mass number from 22 to 46. [13] ...

  3. Isotopes of silicon - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_silicon

    Silicon (14 Si) has 25 known isotopes, with mass numbers ranging from 22 to 46. 28 Si (the most abundant isotope, at 92.23%), 29 Si (4.67%), and 30 Si (3.1%) are stable. The longest-lived radioisotope is 32 Si, which is produced by cosmic ray spallation of argon.

  4. List of elements by atomic properties - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by_atomic...

    This is a list of chemical elements and their atomic properties, ... atomic mass Electronegativity (Pauling) First Ionization ... Si: 28.0855(3) 1.9: 8.15169: 110 ...

  5. Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Atomic_mass

    Atomic mass (m a or m) is the mass of a single atom. ... The 2019 revision of the SI redefined the kilogram using the Planck constant (h), improving the precision of ...

  6. Standard atomic weight - Wikipedia

    en.wikipedia.org/wiki/Standard_atomic_weight

    The calculation is exemplified for silicon, whose relative atomic mass is especially important in metrology. Silicon exists in nature as a mixture of three isotopes: 28 Si, 29 Si and 30 Si. The atomic masses of these nuclides are known to a precision of one part in 14 billion for 28 Si and about one

  7. Atomic units - Wikipedia

    en.wikipedia.org/wiki/Atomic_units

    A set of base units in the atomic system as in one proposal are the electron rest mass, the magnitude of the electronic charge, the Planck constant, and the permittivity. [6] [9] In the atomic units system, each of these takes the value 1; the corresponding values in the International System of Units [10]: 132 are given in the table.

  8. Relative atomic mass - Wikipedia

    en.wikipedia.org/wiki/Relative_atomic_mass

    It defines the mass of a specific isotope, which is an input value for the determination of the relative atomic mass. An example for three silicon isotopes is given below. A convenient unit of mass for atomic mass is the dalton (Da), which is also called the unified atomic mass unit (u).

  9. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    atomic mass constant: 1.660 539 068 92 (52) ... each uncertainty as stated reflects our lack of knowledge of the corresponding value as expressed in SI units, and is ...