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Astatine
Halogen element with symbol At and atomic number 85 <http://periodic.lanl.gov/85.shtml>
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Groundwater quality in the Mojave area, California [More info]
Six elements with human-health concerns were detected at high concentrations: arsenic, boron, fluoride, molybdenum, strontium, and vanadium. Lead was present at moderate concentrations.
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