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Dot-and-cross diagram of Barium Peroxide

purker
in Homework Help

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Can Somebody pls show or explain how the dot and cross diagram works in this question. I've tried drawing in many different ways but this ones a little weird.

cheers

post-111374-0-56161900-1428547292_thumb.png

!

Moderator Note

 

As this reads like an AS level question I have moved it to homework help. Please give us an idea of what you have tried so far.

 

Guys - constructive comments only please.

 

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