Order alphanumeric

The formulas themselves are ordered alphanumerically without exception that is, the formulas listed above follow each other in the sequence BHgN, Br2CsH, CBe203, C3H3AIO9, OgS2Ti. 

This index lists individual, fully specified compositions of matter that are mentioned in the text. It is an index of empirical formulas, ordered according to the following system the elements within a given formula occur in alphabetical sequence except for C, or C and H if present, which always come first. The formulas are ordered alphanumerically without exception. 

Line formulae for different species can be ordered alphanumerically, e.g. in indexes and registries, according to the order of the atomic symbols and the right subscripts to these, e.g. B < BH < BO < B203. The group NH4 is often treated as a single symbol and so listed after Na, for example. 

The Wiswesser Line Notation (WLN) was introduced in 1946, in order to organize and to systematically describe the cornucopia of compounds in a more concise manner. A line notation represents a chemical structure by an alphanumeric sequence, which significantly simplifies the processing by the computer [9-11], (n many cases the WLN uses the standard symbols for the chemical elements. Additionally, functional groups, ring systems, positions of ring substituents, and posi-... 

The ROSDAL syntax is characterized by a simple coding of a chemical structure using alphanumeric symbols which can easily be learned by a chemist [14]. In the linear structure representation, each atom of the structure is arbitrarily assigned a unique number, except for the hydrogen atoms. Carbon atoms are shown in the notation only by digits. The other types of atoms carry, in addition, their atomic symbol. In order to describe the bonds between atoms, bond symbols are inserted between the atom numbers. Branches are marked and separated from the other parts of the code by commas [15, 16] (Figure 2-9). The ROSDAL linear notation is rmambiguous but not unique. 

The subject of color, as it relates to the human eye and brain, is complex and fascinating. Overall, there are many factors that can affect the perceived color of a surface. Models like Munsell use an alphanumeric notation to identify the dimensions for a color and its location within the color space. A Munsell notation (hue, value, and chroma) depends on a subjective visual judgment made by a human observer. There are other color-order systems that specify color by objective three-dimen-... 

Finally, for every technique except polarography itself, there appear in alphanumeric order the code numbers for all of the compounds about which information obtained by that technique appears in Table I. There are a few entries of the form... 

Following the author s name there appear the code numbers of all of the compounds appearing in this volume for which data were taken from the reference given. The appearance in this list of the code number, AC08, with which the present search commenced confirms the accuracy of the reference located. In addition there appear, in alphanumeric order, the code numbers of sixteen other compounds. Usually these additional code numbers denote compounds that are closely related to the one that was originally of interest, or represent data obtained by similar techniques under similar conditions, and in either case provide cross-references that may further illuminate the information already obtained. It should not be inferred that these are complete lists of the compounds about which information is given in the original references, for some of these may have been omitted from this volume... 

In order to open this route of access, as well, the compound index is augmented by successively permuted versions of all empirical formulas. Thus the number of appearances that an empirical formula makes in the compound index is equal to the number of elements it contains. As an example, C3H3AIO9, mentioned above, will appear as such and, at the appropriate positions in the alphanumeric sequence, as H3AIO9C3, AIO9C3H3 and 05C3H3A1. The asterisk identifies a permuted formula and allows the original formula to be reconstructed by shifting to the front the elements that follow the asterisk. 

IR-4.2.3 Structural formulae and the use of enclosing marks in formulae IR-4.2.4 Formulae of (formal) addition compounds IR-4.2.5 Solid state structural information IR-4.3 Indication of ionic charge IR-4.4 Sequence of citation of symbols in formulae IR-4.4.1 Introduction IR-4.4.2 Ordering principles IR-4.4.2.1 Electronegativity IR-4.4.2.2 Alphanumerical order IR-4.4.3 Formulae for specific classes of compounds IR-4.4.3.1 Binary species... 

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