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S. Holman; Phil Stone (2001). Chemistry. Nelson Thornes. p. 26. ISBN 0748762396. The Science House. "Production of Oxygen - Experiment 7". NC State University...5 KB (564 words) - 05:44, 14 August 2023
P 2001, Chemistry, 2nd ed., Nelson Thornes, Walton on Thames, ISBN 0-7487-6239-6 Holt, Rinehart & Wilson c. 2007 'Why Polonium and Astatine are not Metalloids...124 KB (15,305 words) - 19:06, 7 June 2024
