El Número de Avogadro

Dos nuevos elementos superpesados descubiertos

Científicos de un grupo de investigación suizo han descubierto los elementos 113 y 115 en el famoso centro de investigación nuclear de Dubna (que da nombre al elemento 105 también descubierto allí, dubnio).

Para crear el elemento 115 se bombardeó un disco de americio con un rayo de calcio.

En la desintegración del núcleo se emitieron partículas alfa (núcleos de Helio) que dieron lugar a la formación del elemento 113. Se fueron sucediendo desintegraciones formando elementos de menor número atómico (ya descubiertos anteriormente) hasta llegar al dubnio.

Debido a la corta vida de estos elementos (menos de una décima de segundo) se requirieron pruebas adicionales para confirmar que el elemento realmente había llegado a existir. Para ello se puso detrás del disco de americio una lámina de cobre tratada químicamente donde se pudo observar la existencia de 15 átomos de dubnio que se suponían formados a partir de la desintegración de los elementos 115 y 113.

Recordemos que estos dos elementos ya se habían sintetizado anteriormente en el verano de 2003 en ese mismo centro de investigación. Este experimento no ha hecho otra cosa que confirmar claramente la existencia de los mismos (por medio de la técnica de la lámina de cobre).

Referencias

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Comentarios

1. Interesante. Por curiosidad, ¿es posible que haya elementos más pesados pero estables? ¿o son cada vez más inestables y de menor vida media? Recuerdo haber leído algo sobre una (hipotética) "isla" de elemento superpesados y estables pero no he vuelta a saber nada del tema.

   Comentario de Ambros hace 2 años y 32 meses

2. Pues precisamente acerca de eso iba a versar una futura anotación. Pero te adelanto algo :).
   
   Se especula la posibilidad de que haya una posible isla de estabilidad en torno a estos elementos. ¿Porqué? La estabilidad viene en parte por la configuración de los níveles de energía del núcleo. Una configuración completa de un nivel da una mayor estabilidad (similar a lo que pasa con los electrones en la corteza).
   
   Una de estas configuraciones completas es la de 114 protones y 184 neutrones. Esto es, el elemento 114. ¿Se ha logrado? El elemento en cuestión sí (aunque no está confirmado), pero con 9 neutrones por debajo del número ideal, es decir, otro isótopo no estable.
   
   ¿Será realmente estable? ¿Qué aspecto tendría un agregado macroscópico del elemento? Eso por aho está solo en el campo de la ciencia ficción. ¿Seremos capaces de lograrlo? No lo dudo. Seremos capaces de todo lo que nos propongamos.

   Comentario de Gauss hace 2 años y 32 meses

3. Ummm. Las posibilidades son sorprendentes, aunque seria un material extraordinaria caro si hay que construirlo átomo a átomo. Gracias por saciar mi curiosidad, espero no haberte destripado la futura anotación.

   Comentario de Ambros hace 2 años y 32 meses

4. Claro, ese es el principal problema si se consigue. Poder encontrar una forma barata de producirlo industrialmente. :( .
   
   Oh! De nada! Tranquilo, que habrán más cosas en la futura anotación. Y gracias por pasarte por aquí. :).

   Comentario de Gauss hace 2 años y 32 meses

5. ¿Cuales podrían ser las aplicaciones a gran escala de esos elementos, una vez conseguidos de forma estable y producidos industrialmente? Dices que conseguir un agregado macroscópico entra dentro de la ciencia ficción, ¿podemos entonces saber de antemano las características de dicho material? ¿Sus posibles ventajas frente a materiales estables más ligeros ya existentes?
   
   Si las respuestas a estas preguntas están programadas para la futura anotación, puedo esperar :D

   Comentario de ark hace 2 años y 32 meses

6. Paciencia, paciencia ;).

   Comentario de Gauss hace 2 años y 32 meses

7. Hola Gauss, he hecho referencia a tu artículo en mi bloc, enquestador.blocat.com. He intentado enviar un ping pero no se que hago mal o si es q mi servidor de blogs no lo hace bien. Suerte!

   Comentario de cram1010 hace 2 años y 32 meses

8. Ei Gauss!
   
   He intentat enviar-ho tal com m'has dit però tampoc funciona :( Tampoc he pogut amb altres blocs... no sé què passa... per cert, si t'hi has fixat t'he posat també a la secció enllaços. Resulta que jo també sóc estudiant de Química (bé, de fet des del mes passat ja sóc químic) i per tant trobo interesantíssim el teu bloc i ben segur l'aniré seguint :)
   
   Molta sort!!
   

   Comentario de cram1010 hace 2 años y 32 meses

9. Tendré que esforzarme más entonces con cada anotación :D. Yo aún soy estudiante.
   
   Gracias por el apoyo!

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