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Definition:
A substance which cannot be separated into its constituent parts and still
retain its chemical identity. For example, sodium (Na) is an element.
Source & ©:
US EPA
US EPA Drinking Water Glossary, A Dictionary of Technical and Legal Terms
Related to Drinking
Water 
More:
For more information on the table of chemical elements see:
WebElements
Web Elements periodical table of
elements
Related words: Elemental mercury
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