ढाँचा:Infobox helium

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Helium,  2He
Helium discharge tube.jpg
Helium spectra.jpg
Spectral lines of helium
सामान्य गुणहरू
नाम, संकेतhelium, He
उच्चारण/ˈhliəm/ hee-lee-əm
उपस्थितिcolorless gas, exhibiting a red-orange glow when placed in a high-voltage electric field
पेरियोडिक टेबलमा Helium
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (post-transition metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (post-transition metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (post-transition metal)
Tin (post-transition metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (post-transition metal)
Lead (post-transition metal)
Bismuth (post-transition metal)
Polonium (post-transition metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (post-transition metal)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)
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He

Ne
hydrogenheliumlithium
आणविक संख्या2
मानक आणविक भार4.002602(2)
तत्वको श्रेणीnoble gases
समुह, ब्लकgroup 18 (noble gases), s-block
पेरियोडperiod 1
इलेक्ट्रोन वितरण1s2
प्रति सेल2
भौतिक गुणहरू
अवस्थाgas
पग्लने विन्दु(at 2.5 MPa) 0.95 K ​(−272.20 °C, ​−457.96 °F)
उम्लने विन्दु4.22 K ​(−268.93 °C, ​−452.07 °F)
घनत्व at stp (0 °C and 101.325 kPa)0.1786 g·L−1
liquid, at m.p.0.145 g·cm−3
liquid, at b.p.0.125 g·cm−3
क्रिटिकल विन्दु5.19 K, 0.227 MPa
फ्युजनको ताप0.0138 kJ·mol−1
Heat of vaporization0.0829 kJ·mol−1
मोलार ताप क्षमता5R/2 = 20.786 J·mol−1·K−1
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
आणविक गुणहरू
अक्सिडेसन अवस्थाहरू0
इलेक्ट्रो निगेटिभिटीPauling scale: no data
कोभ्यालेन्ट अर्धव्यास28 pm
भ्यान डर वाल अर्धव्यास140 pm
विविध
क्रिस्टल बनावटhexagonal close-packed (hcp)
Hexagonal close-packed crystal structure for helium
ध्वनीको गति972 m·s−1
थर्मल कन्डक्टिभिटी0.1513 W·m−1·K−1
Magnetic orderingdiamagnetic[१]
CAS Registry Number7440-59-7
इतिहास
खोजPierre Janssen, Norman Lockyer (1868)
प्रथम आइसोलेसनWilliam Ramsay, Per Teodor Cleve, Abraham Langlet (1895)
Most stable isotopes
Main article: Isotopes of helium
iso NA half-life DM DE (MeV) DP
3He 0.000137%* 3He is stable with 1 neutron
4He 99.999863%* 4He is stable with 2 neutrons
  • Atmospheric value, abundance may differ elsewhere.
· सन्दर्भ सामाग्रीहरू

References

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

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