<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-893X</journal-id>
<journal-title><![CDATA[Educación química]]></journal-title>
<abbrev-journal-title><![CDATA[Educ. quím]]></abbrev-journal-title>
<issn>0187-893X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Química]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-893X2019000300043</article-id>
<article-id pub-id-type="doi">10.22201/fq.18708404e.2019.3.67888</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Ligações entre metais: reflexões a partir dos modelos empregados em livros didáticos brasileiros de química]]></article-title>
<article-title xml:lang="en"><![CDATA[Metallic chemical bond: reflections from models presented in Brazilian Chemistry Textbooks]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Francisco Junior]]></surname>
<given-names><![CDATA[Wilmo Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Francisco]]></surname>
<given-names><![CDATA[Welington]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[Erivaldo Vieira da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Alagoas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal da Integração Latino-Americana  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Prefeitura Municipal de Garanhuns  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>43</fpage>
<lpage>52</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2019000300043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2019000300043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2019000300043&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumen Este trabalho se propôs a investigar como os modelos de ligação metálica são apresentados por livros didáticos de química aprovados pelo PNLD 2015. A pesquisa foi de natureza qualitativa e seguiu princípios da análise de conteúdo. A análise ocorreu com base em quatro critérios gerais: modelo empregado (clássico, quântico ou ambos); tipo de abordagem (sobre a formação da ligação, estrutura dos metais ou ambas); modos de representação e; limitações. Os resultados demonstraram que os livros valorizam o emprego do modelo dos elétrons deslocalizados como princípio explicativo da formação ligação metálica. Diferentes modos de representação puderam ser observados, mas dificilmente se verificou a combinação do modelo estrutural com o modelo de formação para a ligação. O foco na interação eletrostática como princípio da ligação química é pouco explorado. Limitações dos modelos representados, entre elas a discrepância entre a quantidade e tamanho dos elétrons são omitidas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper aims to investigate aspects of metallic bonding models presented in the chemistry textbooks approved by PNLD. The research was qualitative and was based on principles of content analysis. The analysis considered four basic principles: model employed (classical, quantum or both); approach (about formation of bonds, metallic structure or both); modes of representation and; limitations. The results showed that the books employ the delocalized electron model as an explanatory principle of the metallic bonding. Different modes of representation could be observed. However, the combination of the structural model and the explanatory model in order to explain the metallic bond was not observed. The focus on electrostatic interaction as a principle of chemical bonding is little explored. Limitations of the representations, such as the discrepancy between the quantity and size of the electrons are not discussed.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Ligação metálica]]></kwd>
<kwd lng="pt"><![CDATA[Modelos]]></kwd>
<kwd lng="pt"><![CDATA[Livros didáticos]]></kwd>
<kwd lng="en"><![CDATA[Metallic bonding]]></kwd>
<kwd lng="en"><![CDATA[Models]]></kwd>
<kwd lng="en"><![CDATA[Textbooks]]></kwd>
</kwd-group>
</article-meta>
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