Which is the first element in the periodic table to have an electron configuration in the 4th energy level?

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Potassium is the first element in the periodic table to have an electron configuration in the 4th energy level.

Expert answered|patmarone|Points 2712|

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Asked 12/13/2011 7:44:00 AM

Updated 12/29/2018 9:44:14 PM

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This answer has been confirmed as correct and helpful.

Edited by Masamune [12/29/2018 9:44:12 PM], Confirmed by Masamune [12/29/2018 9:44:13 PM]

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