One of the 103 known chemical substances that cannot be broken down further without changing its chemical properties. Some examples include arsenic, cadmium, lead and mercury.

The term "element" was found in the following pages:

9th Nordic Conference on Plasma Spectrochemistry | EVISA's Agenda of Events
Link database: USGS Method I-1232:Chromium, hexavalent, dissolved, water, FLAA
Material database: International Atomic Energy Agency (IAEA) - IAEA-155 Trace Elements in Whey Powder
Link database: Mineral Information Institute: Tellurium
Instrument database: Bruker Daltonics - aurora Elite - ICP-MS
Instrument database: Agilent Technologies Inc. - 7500cs ICP-MS
Link database: Mineral Information Institute: Arsenic
Link database: NebGuide: Uranium in Drinking Water
Material database: IRMM - Institute for Reference Materials and Measurements - ERM-EC681K POLYETHYLENE (high level)
15th International Conference on Mercury as a Global Pollutantcover | EVISA's Agenda of Events
Material database: Fluka Chemie GmbH - ERM-CC580 Estaurine sediment
Link database: Chemical Fact Sheet: Tellurium
Material database: National Metrology Institute of Japan (NMIJ) - NMIJ CRM 7405-a Trace Elements and Arsenic Compounds in Seaweed (Hijiki)
Material database: National Institute of Standards and Technology (NIST) - SRM 1640a - Trace Elements in Natural Water
Material database: JRC - Joint Research Centre - ERM-CE101 TROUT MUSCLE (trace elements)
2009 ASLO Aquatic Sciences Meeting: Aquatic biogeochemistry as only skin deep | EVISA's Agenda of Events
Highly selective Cr(VI) determination at ultra-trace levels using on-line trapping of Cr(III) with ICP-MS detection | EVISA's News
Instrument database: CPI International - Desolvation system APEX
Material database: National Institute for Environmental Studies (NIES) - NIES CRM 15: Scallop
Material database: National Research Council of Canada (NRC - CNRC) - SLRS-6: River Water Certified Reference Material for Trace Metals and other Constituents