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University of Nottingham
University of Nottingham: Periodic Table of Videos: Phosphorous
A look at phosphorous and its properties that allow it to be used in the head of matches, in the body as an energy molecule, and in reactions with oxygen. [3:46]
Khan Academy
Khan Academy: Science: Quantum Physics: Nuclei: Half Life Plot
Definition of half-life and graphing the decay of phosphorus-32. Calculating how much phosphorus-32 remains after 57.2 days. [6:46]