Electronic configuration of elements: KLMN shells. - Khan Academy
https://www.khanacademy.org/science/in-in-class-10-chemistry-india/x87dd2847d57ee419:in-in-periodic-classification-of-elements-coming-soon/x87dd2847d57ee419:in-in-electronic-configuration-valence-electrons/e/electronic-configuration-and-atomic-number
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