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The helium dimer is a van der Waals molecule with formula He 2 consisting of two helium atoms. [2] This chemical is the largest diatomic molecule—a molecule consisting of two atoms bonded together. The bond that holds this dimer together is so weak that it will break if the molecule rotates, or vibrates too much.
Helium dimer; Helium hydride ion; Helium trimer; L. Lithium helide This page was last edited on 20 July 2016, at 18:30 (UTC). Text is available under the ...
Lewis acid–base complexes between transition metal fragments and noble gases are among the weakest of bonds with substantial covalent character, with (CO) 5 W:Ar having a W–Ar bond dissociation energy of less than 3.0 kcal/mol. [20] Held together entirely by the van der Waals force, helium dimer, He 2, has the lowest measured bond ...
Helium's first ionization energy of 24.57 eV is the highest of any element. [2] Helium has a complete shell of electrons, and in this form the atom does not readily accept any extra electrons nor join with anything to make covalent compounds. The electron affinity is 0.080 eV, which is very close to zero. [2]
Helium dimer This page was last edited on 31 March 2023, at 20:50 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...
In this example, monomer "A" is said to dimerize to give the dimer "A−A". Dicyclopentadiene is an asymmetrical dimer of two cyclopentadiene molecules that have reacted in a Diels-Alder reaction to give the product. Upon heating, it "cracks" (undergoes a retro-Diels-Alder reaction) to give identical monomers:
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An excimer (originally short for excited dimer) is a short-lived polyatomic molecule formed from two species that do not form a stable molecule in the ground state. In this case, formation of molecules is possible only if such atom is in an electronic excited state . [ 1 ]