A Fuzzy Cross-Classification of the Chemical Elements, Based on Their Physical, Chemical, and Structural Features

In this paper we discussed the classification of chemical elements and their properties using a new algorithm, namely fuzzy hierarchical cross-classification. This algorithm, described in ref 3, produces not only a fuzzy partition of the chemical elements but also a fuzzy partition of their considered properties. In this way it is possible to identify which properties (variables) are responsible for the observed similarities or dissimilarities between different elements.