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Bookmark or Share- list of chemical elements - Encyclopedia BritannicaA chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. Here, the elements are ordered alphabetically. Each element is followed by its atomic number, the total number of protons in the atomic nucleus.
- Chemicals, Pesticides and Toxics Topics | US EPAChemicals, Pesticides and Toxics Topics. EPA uses sound science to research safer chemicals and regulate harmful substances. EPA also provides information about specific chemicals and how you can protect yourself, your family and your community.
- CHEMICAL | definition in the Cambridge English Dictionarynoun [ C ] us / ˈkem.ɪ.k ə l / uk / ˈkem.ɪ.k ə l / Add to word list B2 any basic substance that is used in or produced by a reaction involving changes to atoms or molecules: The government has pledged to reduce the amount of chemicals used in food production.
- Chemical substance - WikipediaA chemical substance is a form of matter having constant chemical composition and characteristic properties. [1] [2] Chemical substances can be simple substances (substances consisting of a single chemical element ), [3] chemical compounds, or alloys .
- CHEMICAL | English meaning - Cambridge Dictionaryany basic substance that is used in or produced by a reaction involving changes to atoms or molecules: The government has pledged to reduce the amount of chemicals used in food production. Each year, factories release millions of tons of toxic (= poisonous) chemicals into the atmosphere. Fewer examples
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