ChemistryAtomic structure and bondingWAEC
What is the electron configuration of an atom of atomic number 13?
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Answer: D. 2, 8, 3
The shells fill 2, then 8, leaving 3 in the third shell: 2, 8, 3 (aluminium).
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.