ChemistryAtomic structure and bondingJAMB
An atom has mass number 27 and 14 neutrons. How many electrons are in its outermost shell?
Show answer
Answer: C. 3
Atomic number = 27 − 14 = 13, giving 2, 8, 3, so there are 3 outer electrons (aluminium).
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.