ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ Languages: Chemical element
Definition:
A substance which cannot be separated into its constituent parts and still
retains its chemical identity. For example, sodium (Na) is an element.
Source:
US EPA
Drinking Water Glossary 
More:
For more information on the table of chemical elements see:
WebElements
Periodical table of
elements
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