# halogen
## English
### Etymology

From Ancient Greek ἅλς (háls, “salt" or "sea”) + γεν- (gen-), "to produce" (coined by Berzelius in 1842).

### Pronunciation

* enPR: hălʹə-jən, hāʹlə-jən
* IPA: /ˈhæl.ə.d͡ʒən/, /ˈheɪ.lə.d͡ʒən/
* Audio (Southern England):(file)

### Noun

halogen (plural halogens)
* (chemistry) Any element of group 17, i.e. fluorine, chlorine, bromine, iodine, astatine and tennessine.
* A light fixture in which the filament is surrounded by an atmosphere of a halogen gas.

#### Usage notes

* When the term was coined, all known group 17 elements formed salts on reaction with a metal. This may not be true for the recently discovered superheavy element tennessine, though experiments cannot yet be carried out because of its short lifetime and the difficulty of manufacturing it. Chemists usually include tennessine as a halogen to extend the term to all of group 17, though those specializing in the chemistry of superheavy elements may exclude it.

#### Derived terms

* halogen lamp
* halogen oven
* halogen stove

#### Related terms

* halide

#### Translations
### References

* ↑ Douglas Harper (2001–2025) “halogen”, in Online Etymology Dictionary.

### Further reading

* halogen on Wikipedia.Wikipedia

## Catalan
### Etymology

From halo- +‎ -gen.

### Pronunciation

* IPA: (Central, Balearic) [əˈlɔ.ʒən]
* IPA: (Valencia) [aˈlɔ.d͡ʒen]

### Noun

halogen m (plural halogens)
* halogen

#### Derived terms

* halogenat
* pseudohalogen

### Further reading

* “halogen” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.

## Czech
### Pronunciation

* IPA: [ˈɦaloɡɛn]
* IPA: [ˈɦaloɡɛːn]

### Noun

halogen m inan
* halogen
    Synonym: halový prvek

#### Declension
### Further reading

* “halogen”, in Příruční slovník jazyka českého (in Czech), 1935–1957
* “halogen”, in Slovník spisovného jazyka českého (in Czech), 1960–1971, 1989
* “halogen”, in Internetová jazyková příručka (in Czech), 2008–2025

## Norwegian Bokmål
### Etymology

From Ancient Greek ἅλς (háls, “salt" or "sea”) +‎ -gen.

### Noun

halogen n (definite singular halogenet, indefinite plural halogen or halogener, definite plural halogena or halogenene)
* (chemistry) halogen

### References

* “halogen” in The Bokmål Dictionary.
* “halogen” in Det Norske Akademis ordbok (NAOB).

## Norwegian Nynorsk
### Etymology

From Ancient Greek ἅλς (háls) +‎ -gen.

### Noun

halogen n (definite singular halogenet, indefinite plural halogen, definite plural halogena)
* (chemistry) halogen

### References

* “halogen” in The Nynorsk Dictionary.

## Romanian
### Etymology

Borrowed from French halogène.

### Adjective

halogen m or n (feminine singular halogenă, masculine plural halogeni, feminine and neuter plural halogene)
* halogenic

#### Declension
## Welsh
### Etymology

Borrowed from English halogen.

### Pronunciation

* (North Wales) IPA: /haˈlɔɡɛn/
* (South Wales) IPA: /haˈloːɡɛn/, /haˈlɔɡɛn/
* Rhymes: -ɔɡɛn

### Noun

halogen m (plural halogenau, not mutable)
* (chemistry) halogen
** 1937, R. O. Davies, Elfennau Cemeg (Elements of Chemistry), University of Wales Press:
    Elfen arall yn perthyn i deulu’r halogenau yw ffluorin."Another element belonging to the halogen family is fluorine."

#### Related terms

* halid (“halide”)

### References

* R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “halogen”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies