Arsenic
Chemical element with atomic number 33 (As)
Summary
Arsenic is a chemical element; it has the symbol As and atomic number 33. It is a metalloid and one of the pnictogens, and therefore shares many properties with its group 15 neighbors phosphorus and antimony. Arsenic is notoriously toxic. It occurs naturally in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. It has various allotropes, but only the grey form, which has a metallic appearance, is important to industry.
Originally created by Josh Grosse
8/28/2001, 5:35:55 AM
Modified
6/1/2026, 6:49:59 PM
Recent revisions
Restored revision 1356747966 by [[Special:Contributions/GreenC bot|GreenC bot]] ([[User talk:GreenC bot|talk]]): Undo changes to lead inconsistent with other element articles
Move 1 url. [[User:GreenC/WaybackMedic_2.5|Wayback Medic 2.5]] per [[WP:URLREQ#boston.com]]
Undid revision [[Special:Diff/1354998415|1354998415]] by [[Special:Contributions/IrisChronomia|IrisChronomia]] ([[User talk:IrisChronomia|talk]]) The source talks about compounds of arsenic. Its a non-technical site, and you can see from "Arsenic is a natural component of the earth’s crust and is widely distributed throughout the environment in the air, water and land. It is highly toxic in its inorganic form." that its not elemental arsenic they are talking about
Reverted 1 edit by [[Special:Contributions/Hu741f4|Hu741f4]] ([[User talk:Hu741f4|talk]]): Echo what the source says; no reply to the talk page thread; current wording implies that all arsenic composites are toxic.
Undid revision [[Special:Diff/1354251109|1354251109]] by [[Special:Contributions/IrisChronomia|IrisChronomia]] ([[User talk:IrisChronomia|talk]]) it is related to history of arsenic. It wasn't isolated and identified until the 13th century in Europe
changed previous editor's contrib from "Arsenic containing compounds" to "Arsenic and many of its compounds" since *some* organic arsenic found in seafood is relatively harmless. Cite WHO w/ quotes: "Arsenic is highly toxic in its inorganic form."
These weren't pure arsenic
Undid revision [[Special:Diff/1353394979|1353394979]] by [[Special:Contributions/~2026-28193-36|~2026-28193-36]] ([[User talk:~2026-28193-36|talk]])
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Reverting possible vandalism by [[Special:Contribs/~2026-27936-19|~2026-27936-19]] to version by Unstirredshading23. [[WP:CBFP|Report False Positive?]] Thanks, [[WP:CBNG|ClueBot NG]]. (4511445) (Bot)
Reverted [[WP:AGF|good faith]] edits by [[Special:Contributions/~2026-27530-29|~2026-27530-29]] ([[User talk:~2026-27530-29|talk]]): Typo
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/* Potential role in animals */“Higher” as an evolutionary term is outdated
Change Realgar internal link to direct to article instead of Arsenic Sulfide set index list
