A ABORDAGEM DA REGRA DO OCTETO NOS LIVROS DIDÁTICOS DE QUÍMICA APROVADOS NO PNLD 2018

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ABSTRACT
In this work a qualitative research of the bibliographic type was carried out to investigate if
the chemical textbooks approved by PNLD 2018 use the octet rule when dealing with the
contents of chemical bonds and, if they do, what the approach is like. For this, each book was
analyzed, where it was possible to identify that the majority makes use of the octet rule, being
exclusive only one of the books, which uses concepts related to energy. It is considered that
this approach was the right one because it considers such concepts to explain the occurrence
of chemical bonds. For the other books in which the octet rule was approached in the content
of chemical bonds, the definitions, the historical aspects, the examples, the limitations, the
applications and the images used in each work were analyzed. In this analysis, it is verified
that the octet rule remains a feature widely used by most authors of textbooks and,
consequently, will continue to be used by teachers in Chemistry classes. It is understood that
the rule remains an important procedure to predict the valency and formulas of chemical
compounds, however it should not be used for memorization or as a single response to the
formation, stability and properties of the compounds, disregarding explanations involving
variations of energy in the formation of bonds between atoms.
Keywords: rule octet, textbook, teaching Chemistry.