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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] ...
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.
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 ...
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 ...
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
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.
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).
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 ...