## 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)
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