Arsenic
Links
Visual Elements: Arsenic
http://www.chemsoc.org/viselements/pages/arsenic.html
Source, biological role, physical information, and key isotopes.
Radiochemistry of Arsenic
http://lib-www.lanl.gov/cgi-bin/getfile?rc000052.pdf
Full text of the monograph by J. G. Cuninghame (Atomic Energy Research Establishment, Harwell, Didcot, Berkshire, England). [PDF]
Periodic Table of the Elements: Arsenic
http://www.ktf-split.hr/periodni/en/as.html
Thermal properties, ionisation energies, and reduction potentials.
It's Elemental: Arsenic
http://education.jlab.org/itselemental/ele033.html
Basic physical and historical information.
ChemicalElements.com: Arsenic
http://www.chemicalelements.com/elements/as.html
Basic information, atomic structure, and isotopes.
USGS - Minerals Information: Arsenic
http://minerals.usgs.gov/minerals/pubs/commodity/arsenic/
Overview and a number of publications in PDF format.
Wikipedia: Arsenic
http://www.wikipedia.org/wiki/Arsenic
Details the properties of the element, including its history, applications, and charateristics.
EnvironmentalChemistry.com: Arsenic
http://environmentalchemistry.com/yogi/periodic/As.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Arsenic
http://www.webelements.com/webelements/elements/text/As/key.html
Extensive information on history, uses, occurrence, compounds, and properties of the element.
Lenntech: Arsenic
http://www.lenntech.com/Periodic-chart-elements/As-en.htm
Physical data, chemical properties, health and environmental effects.