Element classification

Of course it is important to distinguish between the shape of the periodic table, which is admittedly a matter of choice or convention, from tables that actually place certain elements in different groups. The point is not whether one should favor a tabular form, in which periods end abruptly, over circular displays which emphasize the continuity of the sequence of the elements for example. The question is rather whether to favor a table that places the element helium among the noble gases, when compared with tables that place this element among the alkaline earths. The wider question is whether elemental classification is an objective matter of fact or whether it is a matter of convention. It is the question of whether helium, for example, has a natural kinship with the noble gases or with the alkaline earths. Or as philosophers of science are apt to say, it is the question of whether or not groups, or families of elements, represent natural kinds. 

Recognition Element Classification and Biosensors for Environmental Analysis... 

The element classifications of Newlands, Meyer, and Mendeleev, and the chain of being of plant and animal species, both pointed to missing members with rather clearly defined characteristics, allowing for a more focused rather than a random search. It became possible to look in particularly likely places for elements or species to fill the gaps with a good chance of success. 

Benfey, O.T. Winter/Spring 1992-1993. Precursors and Cocursors of the Mendeleev Table The Pythagorean Spirit in Element Classification. Journal for the History of Chemistry 13/14 60-66. 

Table 3.5 Element classification by value of their water migration coefficients in conditions of intense waterexchange with surface (Perelman, 1982).

Element classification Radioactive Appearance Silvery white, dense. 

Figure 3.1 0 Elemental classification on the basis of electronic configurations.

Organometallic compounds of the transition elements. Classification of ligands and theories of bonding... 

First, it devalues distribution data. The possibility of the reliability of pattern in distributions is lessened if dispersal is assumed to be a major determining factor. Also, if distributions are represented as ranges within element classifications the precision of distributions and their details are disguised. 

The criticality assessment method supplemented by importance measurements and elements classification method (by logistic regression) was presented in this paper. 

An undoubtedly incomplete classification of polymers based on elemental classification and saponification number is provided in Table 6.2. Note that copolymers are not included in this list. 

NIST (1999) National institute of standards and technology, UNIFORMAT II elemental classification for building specifications, cost estimating, and cost analysis, NISTIR 6389, Washington, DC, p 93. http // www.bfrl.nist.gov/oae/publications/nistirs/6389.pdf... 

Machado published several texts for his students dealing with the whole theory, as well as textbooks for secondary schools, among other publications. Reading the book he wrote with his brother on General Chemistry and Chemical Analysis (1892), used at the Lisbon Industrial Institute as well as at the Polytechnic, we find, under the item Elements classification, some reference to Mendeleeflf s classification. ... 

Huiskonen, J. Pirttild, T. (1998) Sharpening logistics customer service strategy planning by applying Kano s quality element classification. In International Journal of Production Economics, 56-57(3), 253-260. 

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