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هلیوم

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Also known as element 2

عنصر شیمیایی با عدد اتمی ۲

OverviewAI-generated

Helium is a nonmetal and noble gas with the symbol He and atomic number 2. It belongs to the s-block and period 1. The element was discovered on 1868-08-18 by Pierre Janssen, Norman Lockyer, and William Ramsay. It is named after Helios.

Helium has a mass of 4.002602 and a density of 0.1785. Its boiling point is -452.070 or -268.9, and its melting point is 0.95, -272.05, or -458. The speed of sound in helium is 965, and its refractive index is 1.000036. It has an electronegativity of 4.5 and a standard molar entropy of 126.

The substance is a by-product of natural-gas processing. Uses include lifting gas, coolant, component, and food additive. It is approved for topical treatment of chronic obstructive pulmonary disease and Status Asthmaticus, with first approval in 2015.

Synthesized by Vinony from 41 facts across 5 sources: Wikidata, PubChem, PubMed, ChEMBL, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula: He
Molecular weight: 4.0026 g/mol
IUPAC name: helium
SMILES: [He]
InChIKey: SWQJXJOGLNCZEY-UHFFFAOYSA-N
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Drug data · ChEMBL

Max clinical phase: Approved
Molecule type: Small molecule
First approval: 2015
Admin. routes: topical
Indications: chronic obstructive pulmonary disease, Status Asthmaticus

via ChEMBL · EBI

Research

16,441 papers

[Helium gas].ReviewChudoku kenkyu : Chudoku Kenkyukai jun kikanshi = The Japanese journal of toxicology · 2015Yoshitome K
Helium high.Nature · 2014DOI: 10.1038/506266a
Neuroprotective effect of helium after neonatal hypoxic ischemia: a narrative review.ReviewMedical gas research · 2021Deng RM, Li HY, Li X et al.DOI: 10.4103/2045-9912.314332
Helium should be recycled.Nature · 2017DOI: 10.1038/547006a
Helium inhalation injuries managed at emergency departments.Clinical toxicology (Philadelphia, Pa.) · 2021Forrester MBDOI: 10.1080/15563650.2020.1776871
Helium-oxygen therapy in the emergency department.ReviewThe Journal of emergency medicine · 1997McGee DL, Wald DA, Hinchliffe SDOI: 10.1016/s0736-4679(97)00008-5
Helium oxygen mixtures in the intensive care unit.ReviewCritical care (London, England) · 2001Chevrolet JCDOI: 10.1186/cc1019
Helium and other alternative insufflation gases for laparoscopy.ReviewSurgical endoscopy · 2001Neuhaus SJ, Gupta A, Watson DIDOI: 10.1007/s004640080060

Wikidata facts

Instance of: atmophile element
Subclass of: s-block
Part of: period 1
Named after: Helios
Mass: 4.002602
Image: Helium discharge tube.jpg
Has use: food additive

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discoverer or inventor: William Ramsay
atomic number: 2
element symbol: He
Commons category: Helium
topic's main category: Category:Helium
time of discovery or invention: 1868-08-18
electronegativity: 4.5
density: 0.1785
speed of sound: 965
described by source: Granat Encyclopedic Dictionary
by-product of: natural-gas processing
chemical formula: He
canonical SMILES: [He]
boiling point: -268.9
refractive index: 1.000036
standard molar entropy: 126
conjugate acid: hydridohelium(1+)
melting point: -458
electron configuration: 1s²
different from: Hel
antiparticle: anti-helium
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
Stack Exchange tag: astronomy.stackexchange.com/tags/helium
maintained by WikiProject: WikiProject Physics
Commons gallery: Helium

Sources (8)

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