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Helium

Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements, and it does not have a melting point at standard…

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3He
0.0002%
4He
99.9998%
Appearance
colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field
Atomic number (Z)
2
Atomic radius
empirical: 31 pm
Block
s-block

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Overview

History

Characteristics

Compounds

Occurrence and production

Applications

Inhalation and safety

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Map overview Semantic statistics

Helium

Nodes370
Edges369
Triples264
Avg. degree1.99
Density0.005405
Components1

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Helium

Top relations

related to Extraction and use · 31
Helium → After, American Great Plains, Bolling Field, C-7, Cady, David McFarland, December, Dexter, Earth, Erasmus Haworth, Following, Hamilton Cady, Hampton Roads, Kansas, Lawrence, McFarland, Naval Aircraft Factory-built USS, Navy's, Navy's C-class, September
related to Scientific discoveries · 24
Helium → August, D1, D2 Fraunhofer, D3, Earth, Edward Frankland, English, French, Greek, Guntur, He, In, India, It, Italian, Jules Janssen, Lockyer, Luigi Palmieri, Mount Vesuvius, Norman Lockyer
related to Modern extraction and distribution · 22
Helium → Activated, Air Liquide, Algeria, An, By, China, Extracting, For, Grade-A, In, Ningxia, Poland, Qatar, Qatar's, Qatargas, Russia, SCM, Since, Tanzania, The
related to Isotopes · 19
Helium → Big Bang, Earth, Earth's, Extraplanetary, Gerald Kulcinski, He, Helium-3, Helium-4, In, It, Moon, Most, Rocks, The, The Moon's, There, Thus, Trace, Unlike
related to Compounds · 16
Helium → As, Brønsted, He, He2, HeD, HeH, HeNe, HgHe, HgHe10, It, LiHe, The, This, Van, Waals, WHe2
related to External links · 13
Helium → Alfred Leitner, Archived, Geological Survey, Helium Archived, Helsinki University, Nottingham, Technology, The Periodic Table, Ultra Low Temperature Physics, University, Videos, Wayback Machine, Wayback Machine Helium
has application · 11
Helium → Breathing, Controlled, Cryogenics, Leak, MRI, NMR, Of, Other, Pressurizing, Welding, While
related to Natural abundance · 11
Helium → Although, As, Big Bang, CNO, Earth, Earth's, HeH, In, Only, The, Universe
related to Conservation advocates · 10
Helium → According, Congress, In, International Helium Agency, Nobel, Nuttall, Prices, Richardson, Robert Coleman Richardson, Stop
related to Gas and plasma phases · 10
Helium → Because, C4F8, CF4, For, It, Joule, Once, Only, SF6, Thomson

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Important terminology

gas helium-4 hydrogen used liquid also states helium-3 elements natural use united two produced ii element pressure point high per

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Helium3He0.0002%1.00infobox
Helium4He99.9998%1.00infobox
HeliumAppearancecolorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field1.00infobox
HeliumAtomic number (Z)21.00infobox
HeliumAtomic radiusempirical: 31 pm1.00infobox
HeliumBlocks-block1.00infobox
HeliumBoiling point4.222 K ​(−268.928 °C, ​−452.070 °F)1.00infobox
HeliumCAS Number7440-59-71.00infobox
HeliumCovalent radius28 pm1.00infobox
HeliumCritical point5.1953 K, 0.22746 MPa1.00infobox
HeliumCrystal structure​hexagonal close-packed (hcp)1.00infobox
HeliumDensity (at STP)0.1786 g/L1.00infobox
HeliumDiscoveryNorman Lockyer (1868)1.00infobox
HeliumElectron configuration1s21.00infobox
HeliumElectronegativityPauling scale: no data1.00infobox
HeliumElectrons per shell21.00infobox
HeliumFirst isolationWilliam Ramsay, Per Teodor Cleve, Abraham Langlet (1895)1.00infobox
HeliumGroupgroup 18 (noble gases)1.00infobox
HeliumHeat of fusion0.0138 kJ/mol1.00infobox
HeliumHeat of vaporization0.0829 kJ/mol1.00infobox
HeliumIonization energies1st: 2372.3 kJ/mol1.00infobox
HeliumIonization energies2nd: 5250.5 kJ/mol1.00infobox
HeliumMagnetic orderingdiamagnetic1.00infobox
HeliumMain isotopes.mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0…1.00infobox
HeliumMolar heat capacity20.78 J/(mol·K)1.00infobox
HeliumMolar magnetic susceptibility−1.88×10−6 cm3/mol (298 K)1.00infobox
HeliumNamingafter Helios, Greek god of the Sun1.00infobox
HeliumNatural occurrenceprimordial1.00infobox
HeliumOxidation statescommon: (none)1.00infobox
HeliumP (Pa)Vapor pressure (defined by ITS-90) P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1.23 1.67 2.48 4.211.00infobox

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