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Electron dot structure means the no.of valancy electrons of atom are arranged as dots around it...
Potasium is 1A group element so it has only one electron in its valancy shell...
chlorine is 7A group element so it had 7 electrons around it...
:Cl: at top two dots and at bottom one dot....
I am answering with my phone so I unable to write proper structure sorry. ..
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