Sunday, 21 April 2013

1.32 explain, using dot and cross diagrams, the formation of ionic compounds by electron transfer, limited to combinations of elements from Groups 1, 2, 3 and 5, 6, 7

Dot and cross diagrams represent electron transfer. One atom will have dots as electrons, the other crosses.


Here we begin with sodium and chlorine. Sodium looses one electron, so is drawn on the right with one less. Chlorine gains the electron that sodium looses so is drawn with one extra electron: because the electron came from sodium it is a cross instead of a dot.

The ions are drawn in brackets with their charge written outside.

Sorry the picture is hard to see.

13 comments:

  1. why is it "limited to combinations of elements from Groups 1, 2, 3 and 5, 6, 7"??

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    1. Group 8 is stable because it has a full outer shell- this means it they aren't very reactive, so don't form ionic bonds/compounds.

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  2. Could you please relink the photo? It just says photo0858.jpg. Thank you!!

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  3. please could relink the photo? thank you! sorrryyy

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  4. I can't find the original photo, but I've put another one up which does the same job :) It's no problem, thank you guys for pointing it out!

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  5. i understand why group 8 isn't there, but what about group 4?

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  6. Sorry, I still cant see the picture

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  7. Why is group 4 not up? I love your blog x

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  8. http://askcaitlinchemistry.blogspot.co.uk/ there is a picture on here you can use to understand.

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    Replies
    1. Thanks for all your help M, will try and make the corrections when I can, best of luck with your exams.

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