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WAEC Chemistry 2025 Theory — Question 9

Question 9 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

1(e)(iii). Write the electron configuration for 7N3-.

Model answer

1s2 2s2 2p6 (N3- has gained 3 electrons to have a total of 10 electrons)

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