IonSource Atomic Weights
| Atomic Weights for a Select Subset of Biologically Relevant Elements | ||
| Element | Atomic Weight | |
| Hydrogen | H | 1.00794(7) |
| Carbon | C | 12.0107(8) |
| Nitrogen | N | 14.0067(2) |
| Oxygen | O | 15.9994(3) |
| Sulfur | S | 32.065(5) |
| . | . | . |
| Fluorine | F | 18.9984032(5) |
| Sodium | Na | 22.989770(2) |
| Magnesium | Mg | 24.3050(6) |
| Phosphorus | P | 30.973761(2) |
| Chlorine | Cl | 35.453(2) |
| Potassium | K | 39.0983(1) |
| Calcium | Ca | 40.078(4) |
| Manganese | Mn | 54.938049(9) |
| Iron | Fe | 55.845(2) |
| Copper | Cu | 63.546(3) |
| Bromine | Br | 79.904(1) |
| Iodine | I | 126.90447(3) |
| Atomic Weight
is an average weight of the isotopes which takes in to account and weights
the abundance of the naturally occurring isotopes to obtain the final
atomic weight. Hint: Use atomic weight to calculate the
average mass of a molecule.
Note: (1) Since atomic weight is the product of measured
physical characteristics the significant number furthest to the right
carries an uncertainty (n). For example The atomic weight of sulfur
is 32.066 ± 0.006. Reference: IUPAC
Commission on Atomic Weights and Isotopic Abundances, Atomic Weights of
the Elements, Pure Appl. Chem.,71, 1593-1607, (1999).
The full list can be found presented on the web at the following site
http://www.chem.qmw.ac.uk/iupac/AtWt/index.html. For our list there have been recent updates for N, S, Cl, see link below Pure Appl. Chem. Vol. 73, No. 4, pp. 667-683 (2001) table updated to these new values. New IUPAC Publication: ATOMIC WEIGHTS OF THE ELEMENTS 2001, Pure Appl. Chem., Vol. 75, No. 8, pp. 1107–1122, 2003. .pdf No changes made to the elements shown on this page as the result of this publication.
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| Link to IUPAC periodic table with atomic weights to five significant figures. |
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