<?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>S0187-893X2017000400202</article-id>
<article-id pub-id-type="doi">10.1016/j.eq.2017.07.001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La cuarta revolución química (1945-1966). De las sustancias a las especies químicas]]></article-title>
<article-title xml:lang="en"><![CDATA[The fourth chemical revolution (1945-1966). From substances to chemical species]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chamizo Guerrero]]></surname>
<given-names><![CDATA[José Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Química ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>28</volume>
<numero>4</numero>
<fpage>202</fpage>
<lpage>210</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-893X2017000400202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-893X2017000400202&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-893X2017000400202&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Para su enseñanza, se reconstruye la historia de la química alrededor de 5 momentos revolucionarios, presentándose aquí únicamente el cuarto de ellos. Incorporando los instrumentos que contribuyeron a su establecimiento y las subdisciplinas derivadas, además de los conceptos desarrollados, las revoluciones químicas se caracterizan en términos de la noción kuhniana de «ejemplar» y no de «paradigma». Se reconoce, más allá de un dogma, la forma en que se consolidan diferentes entidades «ocultas o escondidas» muy importantes en la enseñanza de la química, como los átomos, las moléculas, los electrones o en este caso el espín. Asimismo, se traza el paso de las sustancias a las especies químicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: With educational purposes, a new chronology is introduced to address the history of chemistry around five revolutionary moments, analysing in this article only the fourth of them. Each revolution is considered in terms of the Kuhnian notion of &#8216;exemplar&#8217; rather than &#8216;paradigm&#8217;. This approach enables the incorporation into the revolutionary process of the instruments that contributed to their establishment, as well as the concepts that were developed and the derived subdisciplines. It is recognized, beyond a dogma, the way in which several &#8216;hidden entities&#8217; very important in the teaching of chemistry &#8210;such as atoms, molecules, electrons or, in this case, spin&#8210; are consolidated. It also traces the passage of the substances to the chemical species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Revolución química]]></kwd>
<kwd lng="es"><![CDATA[Instrumentos]]></kwd>
<kwd lng="es"><![CDATA[Especies químicas]]></kwd>
<kwd lng="es"><![CDATA[Sustancias]]></kwd>
<kwd lng="es"><![CDATA[Espín]]></kwd>
<kwd lng="en"><![CDATA[Chemical revolution]]></kwd>
<kwd lng="en"><![CDATA[Instruments]]></kwd>
<kwd lng="en"><![CDATA[Chemical species]]></kwd>
<kwd lng="en"><![CDATA[Substances]]></kwd>
<kwd lng="en"><![CDATA[Spin]]></kwd>
</kwd-group>
</article-meta>
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<year>1972</year>
<volume>33</volume>
<page-range>145-77</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
