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The longest possible main alkane chain is used; therefore 3-ethyl-4-methylhexane instead of 2,3-diethylpentane, even though these describe equivalent structures. The di-, tri- etc. prefixes are ignored for the purpose of alphabetical ordering of side chains (e.g. 3-ethyl-2,4-dimethylpentane, not 2,4-dimethyl-3-ethylpentane).
In the ICZN, the system is also called binominal nomenclature, [1] "binomi'N'al" with an "N" before the "al", which is not a typographic error, meaning "two-name naming system". [ 2 ] The first part of the name – the generic name – identifies the genus to which the species belongs, whereas the second part – the specific name or specific ...
IUPAC states that, "As one of its major activities, IUPAC develops Recommendations to establish unambiguous, uniform, and consistent nomenclature and terminology for specific scientific fields, usually presented as: glossaries of terms for specific chemical disciplines; definitions of terms relating to a group of properties; nomenclature of chemical compounds and their classes; terminology ...
2.1.2 Period 4. 2.1.3 Period 5. 2.2 ... Use of italic and bold needs to be brought in line with WP: ... The prefixes for naming carbon chains containing one to four ...
Nomenclature (UK: / n oʊ ˈ m ɛ ŋ k l ə tʃ ə, n ə-/, US: / ˈ n oʊ m ə n k l eɪ tʃ ər /) [1] [2] is a system of names or terms, or the rules for forming these terms in a particular field of arts or sciences. [3] (The theoretical field studying nomenclature is sometimes referred to as onymology or taxonymy [4]).
Because the S 2− anion has a subscript of 2 in the formula (giving a 4− charge), the compound must be balanced with a 4+ charge on the Pb cation (lead can form cations with a 4+ or a 2+ charge). Thus, the compound is made of one Pb 4+ cation to every two S 2− anions, the compound is balanced, and its name is written as lead(IV) sulfide.
The use of the term hydrate is still acceptable e.g. Na 2 SO 4 ·10H 2 O, sodium sulfate decahydrate. The recommended method would be to name it sodium sulfate—water(1/10). Similarly other examples of lattice compounds are: CaCl 2 ·8NH 3, calcium chloride— ammonia (1/8) 2Na 2 CO 3 ·3H 2 O 2, sodium carbonate—hydrogen peroxide (2/3)
There is some disagreement as to whether biological nomenclature is considered a part of taxonomy (definitions 1 and 2), or a part of systematics outside taxonomy. [ 8 ] [ 9 ] For example, definition 6 is paired with the following definition of systematics that places nomenclature outside taxonomy: [ 6 ]