IGCSE/O level Chemistry

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How to do well in IGCSE/O level Chemistry?

Following on from "Why study Chemistry?", I will attempt to share with all young chemists- want-to-be some key must- know concepts.

  • Know your periodic table, there is a wealth of information that you can get simply by referring to the periodic table.

The elements in their respective Group have the same number of outermost electrons as their Group number. e.g. Group V elements will have 5 valence electrons. Whereas the elements in their respective Period have the same number of electronic shells as their Period number. e.g. Al is in Group III and in Period 3, therefore it has three electronic shells and three valence electrons. The Group number of the element also suggests how many more or less electrons that the element needs to gain or loose to become as stable as the Group VIII elements. e.g. Since Br is in Group VII, it has 7 valence electrons, to become stable like Group VIII elements, it needs to gain 1 more electron to become octet configuration. By gaining 1 electron in Br, it gains a negative charge as it forms an ionic compound Br-1. Therefore, you can consider that the charges should the elements of Group I to VII loose or gain electrons to be +1, +2, +3, +-4, -2, -1.

At this point, I hope that you have been able to understand the important key concepts that i have shared here. For any further clarification, please feel free to email me.

I shall be updating this post again. Hear from me soon!

Emma for Honsbridge Academy

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