വിക്കിപീഡിയ, ഒരു സ്വതന്ത്ര വിജ്ഞാനകോശം.
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ഹീലിയം, 2He |
General properties |
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Pronunciation | (HEE-lee-əm) |
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Appearance | നിറമില്ല |
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Standard atomic weight (Ar, standard) | 4.002602(2)[1] |
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ഹീലിയം in the periodic table |
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[[Hydrogen|Hydrogen
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[[Helium|Helium
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[[Lithium|Lithium
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[[Beryllium|Beryllium
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[[Boron|Boron
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[[Carbon|Carbon
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[[Nitrogen|Nitrogen
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[[Oxygen|Oxygen
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[[Fluorine|Fluorine
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[[Neon|Neon
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[[Sodium|Sodium
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[[Magnesium|Magnesium
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[[Aluminium|Aluminium
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[[Silicon|Silicon
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[[Phosphorus|Phosphorus
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[[Sulfur|Sulfur
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[[Chlorine|Chlorine
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[[Argon|Argon
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[[Potassium|Potassium
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[[Calcium|Calcium
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[[Scandium|Scandium
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[[Titanium|Titanium
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[[Vanadium|Vanadium
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[[Chromium|Chromium
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[[Manganese|Manganese
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[[Iron|Iron
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[[Cobalt|Cobalt
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[[Nickel|Nickel
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[[Copper|Copper
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[[Zinc|Zinc
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[[Gallium|Gallium
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[[Germanium|Germanium
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[[Arsenic|Arsenic
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[[Selenium|Selenium
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[[Bromine|Bromine
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[[Krypton|Krypton
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[[Rubidium|Rubidium
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[[Strontium|Strontium
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[[Yttrium|Yttrium
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[[Zirconium|Zirconium
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[[Niobium|Niobium
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[[Molybdenum|Molybdenum
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[[Technetium|Technetium
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[[Ruthenium|Ruthenium
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[[Rhodium|Rhodium
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[[Palladium|Palladium
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[[Silver|Silver
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[[Cadmium|Cadmium
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[[Indium|Indium
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[[Tin|Tin
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[[Antimony|Antimony
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[[Tellurium|Tellurium
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[[Iodine|Iodine
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[[Xenon|Xenon
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[[Caesium|Caesium
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[[Barium|Barium
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[[Lanthanum|Lanthanum
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[[Cerium|Cerium
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[[Praseodymium|Praseodymium
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[[Neodymium|Neodymium
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[[Promethium|Promethium
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[[Samarium|Samarium
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[[Europium|Europium
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[[Gadolinium|Gadolinium
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[[Terbium|Terbium
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[[Dysprosium|Dysprosium
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[[Holmium|Holmium
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[[Erbium|Erbium
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[[Thulium|Thulium
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[[Ytterbium|Ytterbium
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[[Lutetium|Lutetium
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[[Hafnium|Hafnium
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[[Tantalum|Tantalum
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[[Tungsten|Tungsten
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[[Rhenium|Rhenium
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[[Osmium|Osmium
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[[Iridium|Iridium
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[[Platinum|Platinum
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[[Gold|Gold
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[[Mercury (element)|Mercury (element)
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[[Thallium|Thallium
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[[Lead|Lead
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[[Bismuth|Bismuth
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[[Polonium|Polonium
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[[Astatine|Astatine
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[[Radon|Radon
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[[Francium|Francium
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[[Radium|Radium
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[[Actinium|Actinium
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[[Thorium|Thorium
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[[Protactinium|Protactinium
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[[Uranium|Uranium
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[[Neptunium|Neptunium
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[[Plutonium|Plutonium
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[[Americium|Americium
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[[Curium|Curium
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[[Berkelium|Berkelium
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[[Californium|Californium
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[[Einsteinium|Einsteinium
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[[Fermium|Fermium
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[[Mendelevium|Mendelevium
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[[Nobelium|Nobelium
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[[Lawrencium|Lawrencium
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[[Rutherfordium|Rutherfordium
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[[Dubnium|Dubnium
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[[Seaborgium|Seaborgium
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[[Bohrium|Bohrium
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[[Hassium|Hassium
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[[Meitnerium|Meitnerium
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[[Darmstadtium|Darmstadtium
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[[Roentgenium|Roentgenium
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[[Copernicium|Copernicium
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[[Nihonium|Nihonium
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[[Flerovium|Flerovium
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[[Moscovium|Moscovium
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[[Livermorium|Livermorium
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[[Tennessine|Tennessine
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[[Oganesson|Oganesson
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- ↑ He ↓ Ne
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ഹൈഡ്രജൻ ← ഹീലിയം → ലിഥിയം
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Atomic number (Z) | 2 |
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Group | group 18 (noble gases) |
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Period | period 1 |
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Block | s-block |
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Electron configuration | 1s2 |
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Electrons per shell | 2 |
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Physical properties |
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Phase at STP | gas |
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Melting point | (at 2.5 MPa) 0.95 K (−272.2 °C, −458.0 °F) |
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Boiling point | 4.22 K (−268.93 °C, −452.07 °F) |
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Density (at STP) | 0.1786 g/L |
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Critical point | 5.19 K, 0.227 MPa |
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Heat of fusion | 0.0138 kJ/mol |
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Heat of vaporization | 0.0829 kJ/mol |
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Molar heat capacity | 20.786 J/(mol·K) |
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Vapor pressure (defined by ITS-90)
P (Pa)
|
1
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10
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100
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1 k
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10 k
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100 k
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at T (K)
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1.23
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1.67
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2.48
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4.21
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Atomic properties |
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Oxidation states | 0 |
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Electronegativity | Pauling scale: no data |
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Atomic radius | calculated: 31 pm |
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Covalent radius | 32 pm |
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Van der Waals radius | 140 pm |
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Spectral lines of ഹീലിയം |
Other properties |
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Crystal structure | hexagonal close-packed (hcp) |
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Thermal expansion | { µm/(m·K) (at 25 °C) |
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Thermal conductivity | 0.1513 W/(m·K) |
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CAS Number | 7440-59-7 |
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Main isotopes of ഹീലിയം |
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- Atmospheric value, abundance may differ elsewhere.
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| references |
- ↑ 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.