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      <title>Historia de la Tabla Peridodica by </title>
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      <pubDate>2021-07-26 17:04:49 UTC</pubDate>
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         <title> 1863</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662124123</link>
         <description><![CDATA[<div><mark>John Newlands</mark> clasificó los elementos establecidos en varios grupos proponiendo la Ley de Octavas</div>]]></description>
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         <pubDate>2021-07-27 13:25:47 UTC</pubDate>
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      <item>
         <title>1869</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662125745</link>
         <description><![CDATA[<div><mark>Dmitri Mendeleev</mark> publicó su primera tabla periódica de los elementos organizada en orden creciente de masa atómica.</div>]]></description>
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         <pubDate>2021-07-27 13:27:09 UTC</pubDate>
         <guid>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662125745</guid>
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      <item>
         <title> 1874</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662133392</link>
         <description><![CDATA[<div>descubrimiento de galio (Ga), escandio (Sc) y germanio (Ge</div>]]></description>
         <pubDate>2021-07-27 13:34:44 UTC</pubDate>
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      <item>
         <title>1817</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662135258</link>
         <description><![CDATA[<div><br><mark>Döbereiner</mark> elabora un informe explicando la relacion de ciertos elementos formando las triadas.<br><br></div>]]></description>
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         <pubDate>2021-07-27 13:36:57 UTC</pubDate>
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      <item>
         <title>1850</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662136764</link>
         <description><![CDATA[<div><mark>En este año ya se contaban con 20 triadas para llegar a la primera clasificación coherente</mark>.</div>]]></description>
         <pubDate>2021-07-27 13:38:38 UTC</pubDate>
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      <item>
         <title>1862</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662138094</link>
         <description><![CDATA[<div><mark>Chancourtois</mark> evidencia la periocidad de ciertos elementos&nbsp;</div>]]></description>
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         <pubDate>2021-07-27 13:40:00 UTC</pubDate>
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      <item>
         <title>1864</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662139358</link>
         <description><![CDATA[<div><mark>Chancourtois y Newlands</mark>, químico inglés, anuncian la Ley de las octavas: las propiedades se repiten cada ocho elementos.<br><br><br></div>]]></description>
         <pubDate>2021-07-27 13:41:22 UTC</pubDate>
         <guid>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1662139358</guid>
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      <item>
         <title>1913</title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1664433464</link>
         <description><![CDATA[<div>El químico ingles <mark>Henry Mosley </mark>determino el numero atómico de los elementos, reagrupándolos en orden creciente de número atómico, tal como la conocemos hoy.</div>]]></description>
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         <pubDate>2021-07-29 23:14:29 UTC</pubDate>
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         <title></title>
         <author>2021050086</author>
         <link>https://padlet.com/2021050086/qmya7k2enyl3ho56/wish/1664442725</link>
         <description><![CDATA[<div>Mis compañeras no les funcionaba su computadora, asi que ellas me pasaron la informacion.</div>]]></description>
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         <pubDate>2021-07-29 23:34:25 UTC</pubDate>
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