Table 1.3 gives the range of atomic mass values for these ten elements, together with the conventional atomic masses which can be used when the source of the sample is unknown. (...) In this book, we will use the conventional atomic masses listed in table 1.3 in any calculations involving these ten elements.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.










