ទំព័រគំរូ:Infobox helium

អេលីយ៉ូម
2He
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 (other metals)
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 (other metals)
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 (other metals)
Tin (other metals)
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 (other metals)
Lead (other metals)
Bismuth (other metals)
Polonium (other metals)
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 (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)


He

Ne
អុីដ្រូសែនអេលីយ៉ូមលីចូម
អេលីយ៉ូម នៅក្នុងតារាងខួបនៃធាតុគីមី
រូបរាង
colorless gas, exhibiting a red-orange glow when placed in an electric field


Spectral lines of helium
លក្ខណៈទូទៅ
ឈ្មោះ, និមិត្តសញ្ញា, លេខ អេលីយ៉ូម, He, 2
Pronunciation /ˈhliəm/
ក្រុម, ខួប, block 18 (noble gases), 1, s
ទម្ងន់អាតូម 4.002602(2)
លេខអេឡិចត្រុង 1s2
2
Physical properties
Phase gas
ដង់ស៊ីតេ (0 °C, 101.325 kPa)
0.1786 g/L
ដង់ស៊ីតេអង្គធាតុរាវ នៅ ចំណុចរលាយ 0.145 g·cm−3
ដង់ស៊ីតេអង្គធាតុរាវ នៅ ចំណុចរំពុះ 0.125 g·cm−3
ចំណុចរលាយ 0.95 K, −272.20 °C, −457.96 °F
ចំណុចរំពុះ 4.222 K, −268.928 °C, −452.070 °F
Triple point 2.177 K, 5.043 kPa
Critical point 5.1953 K, 0.22746 MPa
Heat of fusion 0.0138 kJ·mol−1
Heat of vaporization 0.0829 kJ·mol−1
Molar heat capacity 20.78 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
Atomic properties
ចំនួនអុកស៊ីតកម្ម 0
អេឡិចត្រូនេកាទីវ គ្មានទិន្នន័យ (Pauling scale)
Ionization energies 1st: {{{1st ionization energy}}} kJ·mol−1
2nd: {{{2nd ionization energy}}} kJ·mol−1
Covalent radius 28 pm
Van der Waals radius 140 pm
Miscellanea
ទម្រង់គ្រីស្តាល hexagonal close-packed
Magnetic ordering diamagnetic
Thermal conductivity 0.1513 W·m−1·K−1
Speed of sound 972 m·s−1
CAS registry number 7440-59-7
History
Naming after អេលីអូស, ទេពសុរិយនៃក្រិក
Discovery Pierre Janssen, Norman Lockyer (1868)
First isolation វីលៀម រ៉ាមសេយ, Per Teodor Cleve, Abraham Langlet (1895)
Most stable isotopes
Main article: Isotopes of អេលីយ៉ូម
iso NA half-life DM DE (MeV) DP

ទំព័រគំរូ:Infobox element/isotopes stable ទំព័រគំរូ:Infobox element/isotopes stable

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