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Formulae alphabetical order

In empirical formulas of inorganic compounds, electropositive elements are listed first [3]. The stoichiometry of the element symbols is indicated at the lower right-hand side by index numbers. If necessary, the charges of ions are placed at the top right-hand side next to the element symbol (e.g., S "). In ions of complexes, the central atom is specified before the ligands are listed in alphabetical order, the complex ion is set in square brackets (e.g., Na2[Sn(OH)+]). [Pg.20]

The elements of an organic compound are listed in empirical formulas according to the Hill system [8] and the stoichiometry is indicated by index numbers. Hill positioned the carbon and the hydrogen atoms in the first and the second places, with heteroatoms following them in alphabetical order, e.g., C9H11NO2. However, it was recognized that different compounds could have the same empirical formula (see Section 2.8.2, on isomerism). Therefore, fine subdivisions of the empirical... [Pg.20]

Molecular formulas of organic compounds are customarily presented in the fashion C2H5Br02 The number of carbon and hydrogen atoms are presented first followed by the other atoms in alphabetical order Give the molecular formulas corresponding to each of the compounds in the preceding problem Are any of them isomers ... [Pg.54]

Molecular formula (Section 1 7) Chemical formula in which subscnpts are used to indicate the number of atoms of each element present in one molecule In organic compounds carbon is cited first hydrogen second and the remaining el ements in alphabetical order... [Pg.1288]

Placement of Atoms in a Formula. The electropositive constituent (cation) is placed first in a formula. If the compound contains more than one electropositive or more than one electronegative constituent, the sequence within each class should be in alphabetical order of their symbols. [Pg.213]

The alphabetical order may be different in formulas and names for example, NaNH4HP04, ammonium sodium hydrogen phosphate. [Pg.214]

Isotopically Labeled Compounds. The hydrogen isotopes are given special names H (protium), H or D (deuterium), and H or T (tritium). The superscript designation is preferred because D and T disturb the alphabetical ordering in formulas. [Pg.216]

C. Tomlin, ed.. The Pesticides Manual A World Compendium, Incorporating the Agrochemicals Handbook, 10th ed.. The British Crop Protection Council and The Royal Society of Chemistry, Crop Protection PubHcations, Cambridge, U.K., 1994. Includes 725 entries by common name in alphabetic order, with chemical stmcture, chemical name(s), molecular formula, CAS Registry Number, physicochemical properties, commercialisation, mode of action, uses, trade names, analytical methods, mammalian toxicology, ecotoxicology, and environmental fate. [Pg.153]

In particular, the reactions are arranged in alphabetical order, and treated in a consistent manner. The name of the reaction serves as a heading, while a subtitle gives a one sentence-description of the reaction. This is followed by a formula scheme depicting the overall reaction and a first paragraph with an introductory description of the reaction. [Pg.316]

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 alphanumer-ically without exception. [Pg.610]

When three or more different elements occur in a compound, the order depends on whether or not the compound contains ions. We describe ionic compounds in Section 34. Many multiple-element compounds that do not contain ions contain carbon. The formulas of carbon-containing compounds start with carbon, followed by hydrogen. After that, any other elements appear in alphabetical order, as illustrated by the following examples C2 He O, C4 H5 BrO, CH3 Cl, and Cg Hio N4 O2. [Pg.122]

Inorganic compounds are listed in alphabetical order of the principal element in the empirical formula. [Pg.937]

Therefore, the simplest formula of lysine is C3H7NO (arranging the atoms in alphabetical order). [Pg.28]

Notice, however, that for a quick reference the alphabetical order has been used in the formula index of Chapter 7. [Pg.90]

The formulae of selected compounds and prototypes are listed in alphabetical order. The alphabetical order is also used to define the symbol sequences within all the formulae. Reference is made to the numbers of paragraphs where the specific compound or structure type is described. [Pg.757]

Molecular formula This is arranged by carbon, hydrogen, and remaining elements in alphabetical order in accordance with the system developed by Hill (1900). Molecular formulas are useful for identifying isomers (i.e., compounds with identical molecular formulas) and are required to calculate the formula weight of a substance. [Pg.12]

The simplest kind of formula is a compositional formula or empirical formula, which lists the constituent elements in the atomic proportions in which they are present in the compound. For such a formula to be useful in lists or indexes, an order of citation of symbols (hierarchy) must be agreed. Such hierarchies, often designated seniorities or priorities, are commonly used in nomenclature. For lists and indexes, the order is now generally recommended to be the alphabetical order of symbols, with one very important exception. Because carbon and hydrogen are always present in organic compounds, C is always cited first, H second and then the rest, in alphabetical order. In non-carbon-containing compounds, strict alphabetical order is adhered to. [Pg.9]

We have already mentioned the formulae for groups, such as S04 , without discussing the principles by which such formulae are assembled. These may (or may not) involve some reference to structure. The general approach is to select one or more atom(s) as the central or characteristic atom(s). This is so whether the ion or group is a coordination entity or not. Thus, I in ICl4 , V in V02 and Si and W in [SiW,204o] are all central atoms and are cited first. The subsidiary atoms then follow, in alphabetical order of symbols (this rule is slightly modified for coordination compounds). [Pg.13]

The symbols (formulae) are listed in alphabetical order according to the principles outlined above. Because the terminations -ous and -ic for metal cation names are no longer recommended, these have been excluded, but we have attempted to include all those traditional names that are still allowed. We have not attempted to present names for species of very rare or unlikely occurrence, so there are gaps in the columns. [Pg.43]

Where the entities to be represented are not symmetrical because, for example, they contain atoms of different metals, an order of citation of metals must be established. In a formula, the priority is established by use of Table IV of the Nomenclature of Inorganic Chemistry (Table 3.1 of this book), the highest priority being assigned to the element reached last following the direction of the arrow. In the name, alphabetical order establishes the priority. [Pg.66]

The formulas for compounds described in volume 34 are entered in alphabetical order. They represent the total composition of the compounds, e.g., BF24KC38H21 for potassium tetra-3,5-bis(trifluoro-methyl)phenylborate. The elements in the formulas are arranged in alphabetical order, with carbon and hydrogen listed last. All formulas are permuted on the symbols other than carbon and hydrogen representing organic groups in coordination compounds. Thus potassium tetra-3,5-bis(trifluoro-methyl)phenylborate can be found under B, F, and K in this index. [Pg.241]

Addition compounds. In the formulae of addition compounds, the component mole cules are cited in order of increasing number, if they occur in equal numbers, they are cited in alphabetical order of the first symbols. Addition compounds containing boron compounds or water are exceptional, in that the water or boron compound is died last. If both are present, the boron precedes water. [Pg.520]


See other pages where Formulae alphabetical order is mentioned: [Pg.50]    [Pg.1283]    [Pg.1286]    [Pg.823]    [Pg.1614]    [Pg.23]    [Pg.50]    [Pg.1659]    [Pg.1662]    [Pg.151]    [Pg.520]    [Pg.55]    [Pg.287]    [Pg.1342]    [Pg.411]    [Pg.1247]    [Pg.524]    [Pg.1038]    [Pg.1044]    [Pg.127]   
See also in sourсe #XX -- [ Pg.40 ]




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