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ChemicalElements.com: Scandium

http://www.chemicalelements.com/elements/sc.html

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It's Elemental: Scandium

http://education.jlab.org/itselemental/ele021.html

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WebElements: Oxygen

http://www.webelements.com/oxygen/

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Wikipedia: Oxygen

http://en.wikipedia.org/wiki/Oxygen

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Lenntech: Oxygen

http://www.lenntech.com/Periodic-chart-elements/O-en.htm

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EnvironmentalChemistry.com: Oxygen

http://environmentalchemistry.com/yogi/periodic/O.html

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ChemicalElements.com: Oxygen

http://www.chemicalelements.com/elements/o.html

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Canterbury Christ Church University College

https://www.canterbury.ac.uk/about-us/faculties-schools-and-departments/faculty-of-medicine-health-and-social-care

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