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Quantities, Units and Symbols in Physical Chemistry, also known as the Green Book, is a compilation of terms and symbols widely used in the field of physical chemistry. It also includes a table of physical constants , tables listing the properties of elementary particles , chemical elements , and nuclides , and information about conversion ...
1.6 × 10 33 kg Pleiades star cluster (800 M ☉) [159] 10 34: 10 35 ~10 35 kg Typical globular cluster in the Milky Way (overall range: 3 × 10 3 to 4 × 10 6 M ☉) [160] 2 × 10 35 kg Low end of mass range for giant molecular clouds (1 × 10 5 to 1 × 10 7 M ☉) [161] [162] 7.3 × 10 35 kg Jeans mass of a giant molecular cloud at 100 K and ...
Periodic tables usually at least show the elements' symbols; many also provide supplementary information about the elements, either via colour-coding or as data in the cells. The above table shows the names and atomic numbers of the elements, and also their blocks, natural occurrences and standard atomic weights. For the short-lived elements ...
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
In the following table, the use row is the value recommended for use in other Wikipedia pages in order to maintain consistency across content. 2 He helium-4 Hoffer et al.
The dimensionless (standard) atomic weight is the weighted mean relative isotopic mass of a (typical naturally occurring) mixture of isotopes. The 2019 revision of the SI redefined the kilogram using the Planck constant ( h ), improving the precision of the atomic mass constant by anchoring it to fixed physical constants.
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The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and Δν Cs. —