| NOUN | substance | atomic number 17, chlorine, Cl | a common nonmetallic element belonging to the halogens |
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| Meaning | A common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water). | |
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| Synonyms | chlorine, Cl | |
| Narrower | radiochlorine | A radioactive isotope of chlorine |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| gas | A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely | |
| halogen | Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions | |
| Substance of | sodium chloride, common salt | A white crystalline solid consisting mainly of sodium chloride (NaCl) |
| Spanish | cloro, número atómico 17 | |
| Catalan | Cl, clor, número atòmic 17 | |
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