Rebecca U. Etiubon and Ifang, Kingsley Okon (2017). Flipped classroom as an effective method for teaching valency of elements and chemical formula of compounds. In P. Ibole, M. A. C. Enedoh, E. T. Owoyemi & E. I. Igboegwu (Eds.). STAN Chemistry Panel Workshop Series 13: Chemical Combination and Chemical Reactions: A Handbook for Chemistry Teachers (pp. 19- 21). Abuja: STANPlace. 

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