വിക്കിപീഡിയ, ഒരു സ്വതന്ത്ര വിജ്ഞാനകോശം.
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ഹീലിയം, 2He |
| General properties |
|---|
| Pronunciation | (HEE-lee-əm) |
|---|
| Appearance | നിറമില്ല |
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| Standard atomic weight (Ar, standard) | 4.002602(2)[1] |
|---|
| ഹീലിയം in the periodic table |
|---|
| [[Hydrogen|Hydrogen
|
|
[[Helium|Helium
|
| [[Lithium|Lithium
|
[[Beryllium|Beryllium
|
|
[[Boron|Boron
|
[[Carbon|Carbon
|
[[Nitrogen|Nitrogen
|
[[Oxygen|Oxygen
|
[[Fluorine|Fluorine
|
[[Neon|Neon
|
| [[Sodium|Sodium
|
[[Magnesium|Magnesium
|
|
[[Aluminium|Aluminium
|
[[Silicon|Silicon
|
[[Phosphorus|Phosphorus
|
[[Sulfur|Sulfur
|
[[Chlorine|Chlorine
|
[[Argon|Argon
|
| [[Potassium|Potassium
|
[[Calcium|Calcium
|
[[Scandium|Scandium
|
|
[[Titanium|Titanium
|
[[Vanadium|Vanadium
|
[[Chromium|Chromium
|
[[Manganese|Manganese
|
[[Iron|Iron
|
[[Cobalt|Cobalt
|
[[Nickel|Nickel
|
[[Copper|Copper
|
[[Zinc|Zinc
|
[[Gallium|Gallium
|
[[Germanium|Germanium
|
[[Arsenic|Arsenic
|
[[Selenium|Selenium
|
[[Bromine|Bromine
|
[[Krypton|Krypton
|
| [[Rubidium|Rubidium
|
[[Strontium|Strontium
|
[[Yttrium|Yttrium
|
|
|
[[Zirconium|Zirconium
|
[[Niobium|Niobium
|
[[Molybdenum|Molybdenum
|
[[Technetium|Technetium
|
[[Ruthenium|Ruthenium
|
[[Rhodium|Rhodium
|
[[Palladium|Palladium
|
[[Silver|Silver
|
[[Cadmium|Cadmium
|
[[Indium|Indium
|
[[Tin|Tin
|
[[Antimony|Antimony
|
[[Tellurium|Tellurium
|
[[Iodine|Iodine
|
[[Xenon|Xenon
|
| [[Caesium|Caesium
|
[[Barium|Barium
|
[[Lanthanum|Lanthanum
|
[[Cerium|Cerium
|
[[Praseodymium|Praseodymium
|
[[Neodymium|Neodymium
|
[[Promethium|Promethium
|
[[Samarium|Samarium
|
[[Europium|Europium
|
[[Gadolinium|Gadolinium
|
[[Terbium|Terbium
|
[[Dysprosium|Dysprosium
|
[[Holmium|Holmium
|
[[Erbium|Erbium
|
[[Thulium|Thulium
|
[[Ytterbium|Ytterbium
|
[[Lutetium|Lutetium
|
[[Hafnium|Hafnium
|
[[Tantalum|Tantalum
|
[[Tungsten|Tungsten
|
[[Rhenium|Rhenium
|
[[Osmium|Osmium
|
[[Iridium|Iridium
|
[[Platinum|Platinum
|
[[Gold|Gold
|
[[Mercury (element)|Mercury (element)
|
[[Thallium|Thallium
|
[[Lead|Lead
|
[[Bismuth|Bismuth
|
[[Polonium|Polonium
|
[[Astatine|Astatine
|
[[Radon|Radon
|
| [[Francium|Francium
|
[[Radium|Radium
|
[[Actinium|Actinium
|
[[Thorium|Thorium
|
[[Protactinium|Protactinium
|
[[Uranium|Uranium
|
[[Neptunium|Neptunium
|
[[Plutonium|Plutonium
|
[[Americium|Americium
|
[[Curium|Curium
|
[[Berkelium|Berkelium
|
[[Californium|Californium
|
[[Einsteinium|Einsteinium
|
[[Fermium|Fermium
|
[[Mendelevium|Mendelevium
|
[[Nobelium|Nobelium
|
[[Lawrencium|Lawrencium
|
[[Rutherfordium|Rutherfordium
|
[[Dubnium|Dubnium
|
[[Seaborgium|Seaborgium
|
[[Bohrium|Bohrium
|
[[Hassium|Hassium
|
[[Meitnerium|Meitnerium
|
[[Darmstadtium|Darmstadtium
|
[[Roentgenium|Roentgenium
|
[[Copernicium|Copernicium
|
[[Nihonium|Nihonium
|
[[Flerovium|Flerovium
|
[[Moscovium|Moscovium
|
[[Livermorium|Livermorium
|
[[Tennessine|Tennessine
|
[[Oganesson|Oganesson
|
|
-
↑
He
↓
Ne
|
| ഹൈഡ്രജൻ ← ഹീലിയം → ലിഥിയം
|
| |
| Atomic number (Z) | 2 |
|---|
| Group | group 18 (noble gases) |
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| Period | period 1 |
|---|
| Block | s-block |
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| Electron configuration | 1s2 |
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Electrons per shell | 2 |
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| Physical properties |
|---|
| 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
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
|
|
1.23
|
1.67
|
2.48
|
4.21
|
|
| Atomic properties |
|---|
| Oxidation states | 0 |
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| Electronegativity | Pauling scale: no data |
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| Atomic radius | calculated: 31 pm |
|---|
| Covalent radius | 32 pm |
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| Van der Waals radius | 140 pm |
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| Spectral lines of ഹീലിയം |
| Other properties |
|---|
| 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.
|
| | 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.
