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OpenStudy (anonymous):

what is the first element that has enough electrons to have one in the 3s sublevel

OpenStudy (anonymous):

K?

OpenStudy (ipwnbunnies):

This image is sorta helpful. It tells you the location of valence electrons for certain atoms in their neutral state. http://electronconfiguration.info/Images/periodic-table-electron-config-terms.gif Sodium will have 1 electron in its 3s sublevel, which should be the first element.

OpenStudy (anonymous):

that has to be sodium

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