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			== Halogen ==
			<gallery>
			File:Liquid_fluorine_tighter_crop.jpg\|Liquid fluorine
			File:Chlorine_ampoule.jpg\|Chlorine ampoule
			File:Bromine_25ml.jpg\|Bromine 25ml
			File:Iod_kristall.jpg\|Iod kristall
			File:Difluorine-2D-dimensions.png\|Difluorine 2D dimensions
			File:Fluorine-3D-vdW.png\|Fluorine 3D vdW
			File:Dichlorine-2D-dimensions.png\|Dichlorine 2D dimensions
			File:Chlorine-3D-vdW.png\|Chlorine 3D vdW
			File:Dibromine-2D-dimensions.png\|Dibromine 2D dimensions
			File:Bromine-3D-vdW.png\|Bromine 3D vdW
			File:Diiodine-2D-dimensions.png\|Diiodine 2D dimensions
			File:Iodine-3D-vdW.png\|Iodine 3D vdW
			</gallery>

Prab: CSV import

2024-02-23T15:17:12Z

CSV import

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'''Halogen''' is a group of five chemical elements in the periodic table. They are part of Group 17 (VIIA) elements and consist of: [[fluorine]] (F), [[chlorine]] (Cl), [[bromine]] (Br), [[iodine]] (I), and [[astatine]] (At). The term "halogen" means "salt-former" and compounds containing halogens are called "salts".

== Properties ==
All halogens have 7 electrons in their outer shells, giving them the ability to gain an electron to form anions with a -1 charge. They are nonmetals and have similar properties among each other in many sorts of chemical reactions. Halogens are typically reactive and can be harmful or lethal to biological organisms in sufficient quantities.

=== Fluorine ===
[[Fluorine]] is the most reactive of all elements and no chemical substance is capable of freeing it from its compounds. It is a pale yellow, corrosive gas, which reacts with practically all organic and inorganic substances.

=== Chlorine ===
[[Chlorine]] is a greenish-yellow gas that combines directly with nearly all elements. It is a vital part of many substances including table salt.

=== Bromine ===
[[Bromine]] is the only liquid nonmetallic element at room temperature and it evaporates easily. It is a heavy, mobile, reddish-brown liquid.

=== Iodine ===
[[Iodine]] is a grey, lustrous solid. It volatilizes at ambient temperatures into a pretty blue-violet gas with an irritating odor.

=== Astatine ===
[[Astatine]] is a radioactive element and it is the heaviest halogen. Its chemical properties are believed to be similar to those of iodine.

== Uses ==
Halogen elements have many uses. For example, they are used in lighting, in the production of [[fluorocarbons]] for refrigeration, and in the manufacture of [[dyes]], [[plastics]], and [[pharmaceuticals]]. Halogens are also used in the development of [[photographic film]].

== Health Effects ==
Exposure to halogens can have detrimental health effects. For instance, exposure to fluorine can cause significant irritation and injury to the eyes, skin, nose and respiratory tract. Chlorine gas can cause difficulty breathing and chest tightness.

== See Also ==
* [[Periodic Table]]
* [[Chemical Elements]]
* [[Chemical Reactions]]

[[Category:Chemical Elements]]
[[Category:Chemistry]]
[[Category:Physics]]

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← Older revision		Revision as of 21:29, 23 February 2025
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			== Halogen ==
			<gallery>
			File:Liquid_fluorine_tighter_crop.jpg\|Liquid fluorine
			File:Chlorine_ampoule.jpg\|Chlorine ampoule
			File:Bromine_25ml.jpg\|Bromine 25ml
			File:Iod_kristall.jpg\|Iod kristall
			File:Difluorine-2D-dimensions.png\|Difluorine 2D dimensions
			File:Fluorine-3D-vdW.png\|Fluorine 3D vdW
			File:Dichlorine-2D-dimensions.png\|Dichlorine 2D dimensions
			File:Chlorine-3D-vdW.png\|Chlorine 3D vdW
			File:Dibromine-2D-dimensions.png\|Dibromine 2D dimensions
			File:Bromine-3D-vdW.png\|Bromine 3D vdW
			File:Diiodine-2D-dimensions.png\|Diiodine 2D dimensions
			File:Iodine-3D-vdW.png\|Iodine 3D vdW
			</gallery>

Halogen - Revision history

Prab: CSV import

Prab: CSV import