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WAEC Chemistry 2014 Theory — Question 13

Question 13 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.

2(b)(i). Consider the elements ₁₂Mg and ₁₃Al. Write the electron configuration of each element.

Model answer

Mg (12): 1s²2s²2p⁶3s² Al (13): 1s²2s²2p⁶3s²3p¹

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