Atomic weights of chemical elements according to the IUPAC table.
Usage
AtomicWeight
atomicweight
Format
The capitalized version AtomicWeight is a data frame containing
the IUPAC table of atomic weights.
This data frame has following colums: Number, Name,
Symbol, Weight, Footnotes.
Note that as in the IUPAC table, the Weight is
given as a text rather than as numeric objects. It comprises the standard
values and the uncertainties (in parentheses, following the last significant
figure to which they are attributed).
See IUPAC report for explanation of the Footnotes.
The lower case version atomicweight is a simplified list that only
contains the weights (as numeric values) and allows symbolic
computations with elements to arrive at molecular weights.
Details
Molecular weights of chemical elements may vary due to different isotope
compositions, depending on geology, industrial processes or biological activity.
Please consult the IUPAC Technical report about the details.
The data set contains NA for elements that have no stable isotopes
(except U, Th, Pa).
Author(s)
Thomas Petzoldt
References
Wieser ME, 2006. Atomic weights of the elements 2005 (IUPAC
Technical Report). Pure Appl. Chem. 78 (11), 2051–2066.,
2006. DOI: 10.1351/pac200678112051
See Also
other datasets: Bathymetry,
Constants, Oceans,
molweight for molecular weight calculations with
molecular formulae.
Examples
## assess the data in the IUPAC table (with all footnotes)
AtomicWeight[1:20,]
AtomicWeight[AtomicWeight$Symbol == "C",]
## use the lower case version for simple calculations:
atomicweight$C
with(atomicweight, C)
## it can also be used to calculate molecular weights
## via symbolic computation
with(atomicweight, H * 2 + O)