Abstract
The aim of this study was to identify the influence of chemistry textbooks in the process of teaching/learning of concepts, particularly chemical valence. For this, the form in which the concept is discussed was analyzed in several chemistry textbooks. Also, the influence of the texts was evaluated by applying a survey to a group of 40 students. It was observed that the concept of valence in the texts considered in his study the concept of valence is presented introduces students in incomplete and static form, which allows to explain and comprehend some simple molecules only. The concept of primary valence is not included in most of the books, except those of Chang and Collage and of Petrucci. They are the only ones that include the contributions by Alfred Werner regarding primary and secondary valence. It is concluded that this may be causing the incomplete form in which student understand the concept of valence.
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