4ESO Física i Química , ARTICLE 72 : ELEMENTS VALENCES.
![4ESO Física i Química , ARTICLE 72 : ELEMENTS VALENCES.](https://easyfisquim.blogia.com/upload/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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