ഫലകം:Infobox ഹീലിയം

വിക്കിപീഡിയ, ഒരു സ്വതന്ത്ര വിജ്ഞാനകോശം.
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ഹീലിയം,  2He
Helium discharge tube.jpg
General properties
Pronunciation/ˈhliəm/ (HEE-lee-əm)
Appearanceനിറമില്ല
Standard atomic weight (Ar, standard)4.002602(2)[1]
ഹീലിയം in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
-

He

Ne
ഹൈഡ്രജൻഹീലിയംലിഥിയം
Atomic number (Z)2
Groupgroup 18 (noble gases)
Periodperiod 1
Blocks-block
Electron configuration1s2
Electrons per shell
2
Physical properties
Phase at STPgas
Melting point(at 2.5 MPa) 0.95 K ​(−272.2 °C, ​−458.0 °F)
Boiling point4.22 K ​(−268.93 °C, ​−452.07 °F)
Density (at STP)0.1786 g/L
Critical point5.19 K, 0.227 MPa
Heat of fusion0.0138 kJ/mol
Heat of vaporization0.0829 kJ/mol
Molar heat capacity20.786 J/(mol·K)
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 4.21
Atomic properties
Oxidation states0
ElectronegativityPauling scale: no data
Atomic radiuscalculated: 31 pm
Covalent radius32 pm
Van der Waals radius140 pm
Color lines in a spectral range
Spectral lines of ഹീലിയം
Other properties
Crystal structurehexagonal close-packed (hcp)
Hexagonal close-packed crystal structure for ഹീലിയം
Thermal expansion{ µm/(m·K) (at 25 °C)
Thermal conductivity0.1513  W/(m·K)
CAS Number7440-59-7
Main isotopes of ഹീലിയം
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct
3He 0.000137%* 3He is stable with 1 neutrons
4He 99.999863%* 4He is stable with 2 neutrons
  • Atmospheric value, abundance may differ elsewhere.
| references
  1. Meija, J.; മറ്റുള്ളവർക്കൊപ്പം. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
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