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chemistry questions on peroxides

this may be a bit niche
but on the kerboodle online textbook page 128-129 - there is a diagram on peroxides but I don't know how the left oxygen has 7 outer electrons initially? - could someone please explain and help me out?
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Original post by Garnelee
this may be a bit niche
but on the kerboodle online textbook page 128-129 - there is a diagram on peroxides but I don't know how the left oxygen has 7 outer electrons initially? - could someone please explain and help me out?


Would you be able to attach an image of the diagram please? :smile:

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