helium$34329$ - ορισμός. Τι είναι το helium$34329$
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  3. helium$34329$

Τι (ποιος) είναι helium$34329$ - ορισμός

Diproton; Helium-5; Helium-6; Helium-7; Helium-8; Helium-9; Helium-10; Exotic helium isotopes; Helium-2; Isotopes of Helium; He-2; Helium Isotopes; Helium 2; Helium isotope

Helium compounds         
  • Fluoroheliate ion
  • Crystal structure of the [[hypothetical compound]] MgF<sub>2</sub>He. Helium in white, magnesium in orange and fluorine in blue
CLASS OF IMPROBABLE CHEMICAL COMPOUNDS ONLY FORMED AT VERY HIGH PRESSURE OR LOW TEMPERATURE
Helide; Heliide; Compounds of helium; Dihelium arsenolite; Helium compound; Helium clathrate; Impurity helium gels; Heliumide; Helimide (helium); Helide (helium); He compounds; He compound
Helium is the smallest and the lightest noble gas and one of the most unreactive elements, so it was commonly considered that helium compounds cannot exist at all, or at least under normal conditions. Helium's first ionization energy of 24.
https://en.wikipedia.org/wiki/Helium_compounds
Helium         
  • Liquefied helium. This helium is not only liquid, but has been cooled to the point of [[superfluid]]ity. The drop of liquid at the bottom of the glass represents helium spontaneously escaping from the container over the side, to empty out of the container. The energy to drive this process is supplied by the potential energy of the falling helium.
  • alt=Photo of a large, metal-framed device (about 3×1×1.5 m) standing in a room.
  • Binding energy per nucleon of common isotopes. The binding energy per particle of helium-4 is significantly larger than all nearby nuclides.
  • url-status= live}}</ref>
  • Structure of the suspected fluoroheliate anion, OHeF<sup>−</sup>
  • alt=The Good Year Blimp
  • alt=Illuminated light red gas discharge tubes shaped as letters H and e
  • Structure of the [[helium hydride ion]], HHe<sup>+</sup>
  • nucleus]] (pink) and the [[electron cloud]] distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case.
  • alt=Picture of visible spectrum with superimposed sharp yellow and blue and violet lines
  • Historical marker, denoting a massive helium find near [[Dexter, Kansas]]
  • alt=A large solid cylinder with a hole in its center and a rail attached to its side.
  • Sir [[William Ramsay]], the discoverer of terrestrial helium
CHEMICAL ELEMENT WITH SYMBOL HE AND ATOMIC NUMBER 2; RARE GAS
Element 2; Two fluid model for helium; Atomic number 2; E939; Helium II; Solid Helium; Balloon grade helium; Superfluid helium; Inhaling Helium; ATC code V03AN03; ATCvet code QV03AN03; Helium gas; Helium shortage; He (element); Helium voice; Helium speech; Cleveite gas; History of helium; Properties of helium
·noun A gaseous element found in the atmospheres of the sun and earth and in some rare minerals.
II. Helium ·add. ·noun An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth's atmosphere, in several minerals and in certain mineral waters. Symbol, He; at. wt., 4. Helium was first detected spectroscopically in the sun by Lockyer in 1868; it was first prepared by Ramsay in 1895. Helium has a density of 1.98 compared with hydrogen, and is more difficult to liquefy than the latter. Chemically, it belongs to the argon group and cannot be made to form compounds. It is a decomposition product of the radium emanation.
helium         
  • Liquefied helium. This helium is not only liquid, but has been cooled to the point of [[superfluid]]ity. The drop of liquid at the bottom of the glass represents helium spontaneously escaping from the container over the side, to empty out of the container. The energy to drive this process is supplied by the potential energy of the falling helium.
  • alt=Photo of a large, metal-framed device (about 3×1×1.5 m) standing in a room.
  • Binding energy per nucleon of common isotopes. The binding energy per particle of helium-4 is significantly larger than all nearby nuclides.
  • url-status= live}}</ref>
  • Structure of the suspected fluoroheliate anion, OHeF<sup>−</sup>
  • alt=The Good Year Blimp
  • alt=Illuminated light red gas discharge tubes shaped as letters H and e
  • Structure of the [[helium hydride ion]], HHe<sup>+</sup>
  • nucleus]] (pink) and the [[electron cloud]] distribution (black). The nucleus (upper right) in helium-4 is in reality spherically symmetric and closely resembles the electron cloud, although for more complicated nuclei this is not always the case.
  • alt=Picture of visible spectrum with superimposed sharp yellow and blue and violet lines
  • Historical marker, denoting a massive helium find near [[Dexter, Kansas]]
  • alt=A large solid cylinder with a hole in its center and a rail attached to its side.
  • Sir [[William Ramsay]], the discoverer of terrestrial helium
CHEMICAL ELEMENT WITH SYMBOL HE AND ATOMIC NUMBER 2; RARE GAS
Element 2; Two fluid model for helium; Atomic number 2; E939; Helium II; Solid Helium; Balloon grade helium; Superfluid helium; Inhaling Helium; ATC code V03AN03; ATCvet code QV03AN03; Helium gas; Helium shortage; He (element); Helium voice; Helium speech; Cleveite gas; History of helium; Properties of helium
Helium is a very light gas that is colourless and has no smell.
N-UNCOUNT

Βικιπαίδεια

Isotopes of helium

Although there are nine known isotopes of helium (2He) (standard atomic weight: 4.002602(2)), only helium-3 (3
He
) and helium-4 (4
He
) are stable. All radioisotopes are short-lived, the longest-lived being 6
He
 with a half-life of 806.92(24) milliseconds. The least stable is 10
He
, with a half-life of 260(40) yoctoseconds (2.6(4)×10−22 s), although it is possible that 2
He
 may have an even shorter half-life.

In the Earth's atmosphere, the ratio of 3
He
 to 4
He
 is 1.343(13)×10−6. However, the isotopic abundance of helium varies greatly depending on its origin. In the Local Interstellar Cloud, the proportion of 3
He
 to 4
He
 is 1.62(29)×10−4, which is 121(22) times higher than that of atmospheric helium. Rocks from the Earth's crust have isotope ratios varying by as much as a factor of ten; this is used in geology to investigate the origin of rocks and the composition of the Earth's mantle. The different formation processes of the two stable isotopes of helium produce the differing isotope abundances.

Equal mixtures of liquid 3
He
 and 4
He
 below 0.8 K separate into two immiscible phases due to differences in quantum statistics: 4
He
 atoms are bosons while 3
He
 atoms are fermions. Dilution refrigerators take advantage of the immiscibility of these two isotopes to achieve temperatures of a few millikelvins.

https://en.wikipedia.org/wiki/Isotopes of helium
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