氬

Also known as Ar, element 18, 18Ar

原子序為18的化學元素

OverviewAI-generated

Argon is a chemical element with the symbol Ar and atomic number 18. Its standard molar entropy is 154.8, and it has a mass of 39.95. The element’s electron configuration is listed as 1s² 2s² 2p⁶ 3s² 3p⁶, or [Ne] 3s² 3p⁶. It was discovered in 1894.

The substance has a melting point of -189.34 and a boiling point of -185.85. Its speed of sound is 813, and its dynamic viscosity is 22.7. Argon is represented by the Unicode character 氬. It has zero hydrogen bond donors and acceptors, with a charge of 0.

Synthesized by Vinony from 27 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

In the Vinony graph

Vinony's link graph records 1,178 inbound references to 氬, and connects out to block, incandescent light bulb and isotope of argon.

It sits within the topics Argon, Chemical elements and E-number additives.

Vinony links it to 165 Wikipedia language editions.

Chemical data

Formula: Ar
Molecular weight: 39.9 g/mol
IUPAC name: argon
SMILES: [Ar]
InChIKey: XKRFYHLGVUSROY-UHFFFAOYSA-N
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Research

21,127 papers

Argon neuroprotection in ischemic stroke and its underlying mechanism.ReviewBrain research bulletin · 2024Bao L, Liu Y, Jia Q et al.DOI: 10.1016/j.brainresbull.2024.110964
Argon pharmacokinetics: a solubility measurement technique.Medical gas research · 2023Lemaire J, Heninger M, Louarn E et al.DOI: 10.4103/2045-9912.351106
Xenon and Argon as Neuroprotective Treatments for Perinatal Hypoxic-Ischemic Brain Injury: A Preclinical Systematic Review and Meta-Analysis.Anesthesia and analgesia · 2025Barros M, Liang M, Iannucci N et al.DOI: 10.1213/ANE.0000000000007223
Argon neuroprotection.Critical care (London, England) · 2010Sanders RD, Ma D, Maze MDOI: 10.1186/cc8847
Argon: The Future Organ Protectant?Annals of cardiac anaesthesia · 2019Nair SGDOI: 10.4103/aca.ACA_180_18
Argon: systematic review on neuro- and organoprotective properties of an "inert" gas.International journal of molecular sciences · 2014Höllig A, Schug A, Fahlenkamp AV et al.DOI: 10.3390/ijms151018175
The Molecular Pathway of Argon-Mediated Neuroprotection.ReviewInternational journal of molecular sciences · 2016Ulbrich F, Goebel UDOI: 10.3390/ijms17111816
Argon-stimulated nitric oxide production and its function in alfalfa cadmium tolerance.Environmental pollution (Barking, Essex : 1987) · 2023Wang J, Liu B, Jin Z et al.DOI: 10.1016/j.envpol.2023.122009

via PubMed

Wikidata facts

Instance of: atmophile element
Subclass of: noble gases
Part of: noble gases
Named after: laziness
Mass: 39.95
Image: ArTube.jpg
Has use: food additive

Show 17 more facts

element symbol: Ar
Commons category: Argon
topic's main category: Category:Argon
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
atomic number: 18
speed of sound: 813
discoverer or inventor: John Strutt, 3rd Baron Rayleigh
Commons gallery: Argon
canonical SMILES: [Ar]
chemical formula: Ar
time of discovery or invention: 1894-00-00
standard molar entropy: 154.8
dynamic viscosity: 22.7
Unicode character: 氬
electron configuration: [Ne] 3s² 3p⁶
melting point: -189.34
boiling point: -185.85

Sources (6)

via Wikidata · CC0

Article · 中文

氬（拼音：yà，注音：丨ㄚˋ；英語：Argon），是一種化學元素，化學符號为Ar，原子序數为18，原子量為39.948 u，位在週期表的第18族，是一種惰性氣體。氬佔大氣體積的0.934%（9340 ppmv），是地球大氣層第三多的氣體，是水蒸氣的兩倍以上（平均4000 ppmv左右，但變化很大）、二氧化碳（400 ppmv）的23倍之多、氖（18 ppmv）的500倍以上。氬是地殼含量中最豐富的惰性元素，在地殼中佔了0.00015%。已知的氬的同位素共有14種，包括氬33至氬46。地球大氣中大部分的氬元素是氬-40（由地殼中的鉀-40衰變而來）。氬-36是宇宙中最為常見的氬同位素，因為它是最容易由超新星核融合產生的產物。 "argon"這個名稱源自於希臘語中的 ἀργόν，意思是「懶惰的」、「不活躍的」，如此命名是因為這個元素幾乎不進行化學反應。氬在原子外部殼層完整的八隅體（8個電子）讓它變得更加穩定，也不容易與其它元素產生鍵結。它的三相點以國際實用溫標定義為83.8058K。氬元素在工業製程上是藉由分餾而得。氬常常作為，應用在焊接或是其他可以增加物質反應能力的高溫工業製程。例如，在石墨電爐中加入氬氣以防止石墨燃燒。氬氣也用於白熾燈、螢光燈、其他氣體放電管和螢光輝光啟動器。氬在被激發後可放出青色的氣體雷射。

Abstract from DBpedia / Wikipedia · CC BY-SA