Why can Period 3 only contain upto 8 electrons, not 18?

Subject: Why can Period 3 only contain upto 8 electrons, not 18?

Date: Wed Aug 30 10:29:44 2000
Posted by Chris H
Grade level: undergrad School: St Francis'
City: Liverpool State/Province: Merseyside Country: United Kingdom
Area of science: Chemistry
ID: 967645784.Ch

Message:


Period 3 contains 8 electrons, but the 3d sub-shell adds another 10 to 
Period 4 not Period 3, why is this? This fact has bugged me since we learnt 
about electron structures in Senior School. It would be nice to finally 
resolve the issue, as neither me nor my friends can adequately say.

Re: Why can Period 3 only contain upto 8 electrons, not 18?

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