Atomic weights, inside front cover

Why does this happen Looking at the periodic tabie on the inside front cover, can you find an example other than Ar and K where the order of the elements would be different if the elements were arranged in order of increasing atomic weight ... 

The mass for each element is given in the table inside the front cover of this book. This value, even though it is actually a mass, is sometimes called (for historical reasons) the atomic weight for each element. 

When you need values of atomic weights, consult the periodic table or the alphabetical listing of elements, both found on facing pages inside the front cover. 

Atomic weights and atomic numbers of the elements, listed alphabetically, are given on the front inside cover of this text. The values are a composite of the best agreements among the tables in the websites listed below. Additional information about each element can be found jBrom various versions of the periodic. table. There are many available on the Web. Following are some recommended ones. In most, you can click on an element and obtain atomic weight and number and other properties such as isotopes, physical properties, and history of the element. 

The average atomic mass for each element is listed in tables found inside the front cover of this book. Chemists often call these values the atomic weights for the elements, although this terminology is passing out of use. 

The atomic weights of the elements are listed in both the periodic table and the table of elements inside the front cover of this text. 

The average atomic mass of each element (expressed in amu) is also known as its atomic weight. Although the term average atomic mass is more proper and the simpler term atomic mass is frequently used, the term atomic weight is most common. The atomic weights of the elements are listed both in the periodic table and in the table of elements, which are found inside the front cover of this text. 

Use atomic weights from the periodic table inside the front cover to determine the molecular weight of urea, CH4N2O, the chemical form in which much nitrogenous body waste is excreted in the urine. 

A chemically pure organic compound will give a mixture of mass spectra because the elements that compose it are not isotopically pure. Recall the case of the element neon, which Sir J. J. Thomson (1913) showed gave not one peak at its chemical atomic weight of 20.2, but two peaks at masses 20.0 and 22.0, in relative abundances of 10 1. Of the common elements encountered in organic compounds (shown in Table 2.1, inside the front cover), many have more than one isotope of appreciable natural abundance. The isotopic abundances of other... 

Using atomic weight, crystal structure, and atomic radius data tabulated inside the front cover of the book, compute the theoretical densities of aluminum (Al), nickel (Ni), magnesium (Mg), and tungsten (W), and then compare these values with the measured densities listed in this same table. The c/a ratio for Mg is 1.624. 

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