REAGENT CHEMICALS
Appendix pubs.acs.org/doi/book/10.1021/acsreagents
Conventional Atomic Weight Values for Selected Elements For users needing specific atomic weight values for those elements with standard atomic weights given as intervals, such as for trade and commerce, use the atomic weight values with no uncertainty listed below. For very exacting calculations, it may be necessary to determine the exact atomic weight of the elements in the particular sample at hand.
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Element
Symbol
Atomic Number
Boron
B
5
Reference Atomic Weight 10.81
Bromine
Br
35
Carbon
C
6
79.904 12.011 12.011
Chlorine
Cl
17
35.45
Hydrogen
H
1
1.008
Lithium
Li
3
6.94
Magnesium
Mg
12
24.305
Nitrogen
N
7
14.007
Oxygen
O
8
15.999
Silicon
Si
14
28.085
Sulfur
S
16
32.06
Thallium
Tl
81
204.38
Source: Reprinted with permission from IUPAC, 2013. Copyright 2013 IUPAC.
DOI:10.1021/acsreagents.6005
A ACS Reagent Chemicals, Part 6 ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017. © 2017 American Chemical Society
