![]() For elements 101-103 the systematic names are minor alternatives to the trivial names already approved by IUPAC. The existence of a systematic nomenclature for the unknown elements does not deny the right of 'discoverers' of new elements to suggest other names to the Commission after their discovery has been established beyond all doubt in the general scientific community. Any ad hoc method of removing such duplication will destroy the systematic derivation of the symbol. The Commission recommends the use of three-letter symbols because any systematically derived set of two-letter symbols will tend to duplicate some of the two-letter symbols of elements of atomic numbers less than 104. The reasons for principles (i), (ii), and (iv) are obvious but those for (iii) are not so immediately apparent. (iv) The symbols should be derived directly from the atomic numbers and be visually related to the names as far as possible. (iii) The symbols for the systematically named elements should consist of three letters. (ii) The names should end in 'ium' whether the element was expected to be a metal or otherwise. (i) The names should be short and obviously related to the atomic numbers of the elements. The Commission decided that these elements would be best named systematically and that names should accord with the following principles: Names are needed for indexing and other purposes and the Commission on Nomenclature of Inorganic Chemistry was asked to make recommendations concerning names and symbols of the heavy 'unknown' elements. The status of these names and symbols is in no way affected by the recommendation of systematic names for elements of atomic numbers greater than 100.Įlements of atomic numbers greater than 103 are often referred to in the scientific literature but receive names only after they have been 'discovered'. Recommendations for the Naming of Elements of Atomic Numbers Greater than 100Įlements of atomic numbers of 101 to 103 have trivial names and corresponding two letter symbols approved by IUPAC. ![]() If you need to cite these rules please quote these references as their source. Mile End Road, London, E1 4NS, Rules are as close as possible to the published version prepared by J. School of Biological and Chemical Sciences, Queen Mary and Westfield College, Recommendations for the Naming of Elements of Atomic Numbers Greater than 100 (Rules Approved 1978) Element names >100 Commission on the Nomenclature of Inorganic Chemistry
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