Periodic classification: a didactic example to teach principal component analysis

Quimica nova

Veras, Germano¹  Lyra, Wellington da Silva²  Araújo, Mario Cesar Ugulino de²  Fragoso, Wallace Duarte²  Silva, Edvan Cirino da² 

[1] Universidade Estadual da Paraíba, Campina Grande, Brasil;Universidade Federal da Paraíba, João Pessoa, Brasil

关键词: principal components analysis;    semimetals;    chemical properties of the elements.;   

DOI  :  10.1590/S0100-40422010000700030

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A dataset of chemical properties of the elements is used herein to introduce principal components analysis (PCA). The focus in this article is to verify the classification of the elements within the periodic table. The reclassification of the semimetals as metals or nonmetals emerges naturally from PCA and agrees with the current SBQ/IUPAC periodic table. Dataset construction, basic preprocessing, loading and score plots, and interpretation have been emphasized. This activity can be carried out even when students with distinct levels of formation are together in the same learning environment.

【 授权许可】

CC BY