20161026163344-foto-valencias.jpg

 - Here you have the link to see the picture  in a bigger view :

  




- Studying oxidation number of aluminium and boron group :









  - HOMEWORK FOR FRIDAY 4-11-16 :

    Read ,study and make all exercices from page 170 and 171, and finish watching last videos from this article 72, and study elements valences!!.









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