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.

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