It's Elemental: Tin
Basic physical and historical information.
http://education.jlab.org/itselemental/ele050.html
Visual Elements: Lead
Image, uses, physical information, and key isotopes.
http://www.chemsoc.org/viselements/pages/lead.html
ChemicalElements.com: Gold
Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/au.html
Neon
Data tables and historic information.
http://www.scescape.net/~woods/elements/neon.html
WebElements: Iron
Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelements/elements/text/Fe/key....
ChemGlobe: Zinc
Electronic, thermal, and steric data along with an isotope table.
http://www.vcs.ethz.ch/chemglobe/ptoe/_/30.html
Boron
Data tables and historic information.
http://www.scescape.net/~woods/elements/boron.html
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