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6 50 cm 1 108 f 4 he binding energy 3 85 cm 1 108 cl 4 he binding energy 7 48 cm 1 108 br 4 he binding energy 7 75 cm 1 108 i 4 he binding energy 8 40 cm 1 108 n 4 he binding energy 2 85 cm 1 108 p 4 he binding energy 3 42 cm 1 108 as 4 he binding energy 3 49 cm 1 108 bi 4 he binding energy 33 26 cm 1 108 si 4 he binding energy 1 95 cm 1 108 ge 4 he binding energy 2 08 cm 1 108 cah 4 he binding energy 0 96 cm 1 108 nh 4 he binding energy 4 42 cm 1 108 mnh 4 he binding energy 1 01 cm 1 108 ybf 4 he binding energy 5 57 cm 1 108 i 4 2 he or i 3 2 he 109 bonds are predicted to form to nickel with helium as a weak ligand in henico and henin 2 101 heo lif 2 is predicted to form a planar metastable molecule 110 1 tris pyrazolyl borate beryllium and 1 tris pyrazolyl borate magnesium are predicted to bind helium at low temperatures 111 there is also a prediction of a he o bond in a molecule with caesium fluoride or tetramethyl ammonium fluoride 112 lihe 2 is predicted to be in an efimov state when excited 113 predicted ions edit fluoroheliate ion many ions have been investigated theoretically to see if they could exist just about every diatomic cation with helium has been studied for the diatomic dications for stability the second ionization level of the partner atom has to be below the first ionization level of helium 24 6 ev for li f and ne the ground state is repulsive so molecules will not form for n and o the molecule would break up to release he however hebe 2 heb 2 and hec 2 are predicted to be stable also second row elements from na to cl are predicted to have a stable hex 2 ion 70 hey 3 is predicted to be the lightest stable diatomic triply charged ion 114 other possibly thermochemically stable ions include hezr 3 hehf 3 hela 3 hend 3 hece 3 hepr 3 hepm 3 hesm 3 hega 3 hetb 3 hedy 3 heho 3 heer 3 hetm 3 and helu 3 where the third ionization point is below that of helium 70 the positronium helide ion pshe should be formed when positrons encounter helium 115 the fluoroheliate fheo ion should be stable but salts like lifheo are not stable 116 71 hheco theoretical 117 fhes is predicted to be stable 118 fhebn hhen 2 is unlikely to exist 119 hhe oh 2 is probably unstable 120 the lithium hydrohelide cation hlihe is linear in theory this molecular ion could exist with big bang nucleosynthesis elements 121 other hydrohelide cations that exist in theory are hnahe sodium hydrohelide cation hkhe potassium hydrohelide cation hbehe 2 beryllium hydrohelide cation hmghe 2 magnesium hydrohelide cation and hcahe 2 calcium hydrohelide cation 121 hebeo is predicted to have a relatively high binding energy of 25 kcal mol 1 122 similarly the ethynylhelium cation hec ch is predicted to be bound with respect to ethynyl cation and helium by 22 kcal mol however vinylhelium hech ch 2 0 03 kcal mol and methylhelium hech 3 1 5 kcal mol cations are predicted to be bound much more weakly 123 hche 71 hchehe 71 for negative ions the adduct is very weakly bound 70 those studied include hecl hebr hef heo and hes 71 fhes 71 fhese 71 c 7 h 6 he 2 71 c 7 h 6 hehe 2 71 fhecc 71 hheoh 2 71 hhebf 71 henc 71 henn 71 hhenn h he 0 765 å he n bond length 2 077 å decomposition barrier of 2 3 kj mol 71 hhenh 3 is predicted to have a c 3v symmetry and a h he bond length of 0 768 å and he n 1 830 the energy barrier against decomposition to ammonium is 19 1 kj mol with an energy release of 563 4 kj mol cleavage to helium hydride ion and ammonia is predicted to be endothermic requiring 126 2 kj mol 71 discredited or unlikely observations edit numerous researchers attempted to create chemical compounds of helium in the early part of the twentieth century 124 in 1895 l troost and l ouvrard believed they had witnessed a reaction between magnesium vapour and helium and also argon due to the spectrum of helium disappearing from the tube they were passing it through 125 in 1906 w ternant cooke claimed to have noticed a reaction of helium with cadmium or mercury vapour by observing an increase in the density of the vapour zinc vapour did not react with helium 126 j j manley claimed to have found gaseous mercury helide hehg in 1925 127 128 129 hghe 10 130 131 publishing the results in nature but then had trouble finding a stable composition and eventually gave up morrison thought that helium if irradiated so that one electron is pushed to a higher orbit would behave like hydrogen consequently he predicted that radioactive elements might form helides and claimed in 1928 to succeed in forming a compound of helium with lead 214 and a compound of helium with bismuth 214 132 between 1925 and 1940 in buenos aires horacio damianovich studied various metal helium combinations including beryllium behe iron fehe palladium pdhe platinum pt 3 he bismuth and uranium 133 92 to make these substances electrical discharges impacted helium into the surface of the metal 4 later these were demoted from the status of compounds to that of alloys 53 platinum helide pt 3 he was discredited by j g waller in 1960 134 palladium helide pdhe is formed from tritium decay in palladium tritide the helium 3 he is retained in the solid as a solution boomer claimed the discovery of tungsten helide whe 2 as a black solid 135 it is formed by way of an electric discharge in helium with a heated tungsten filament when dissolved in nitric acid or potassium hydroxide tungstic acid forms and helium escapes in bubbles the electric discharge had a current of 5 ma and 1 000 v at a pressure between 0 05 and 0 5 mmhg for the helium the process works slowly at 200 v and 0 02 mmhg of mercury vapour accelerates tungsten evaporation by five times the search for this was suggested by ernest rutherford it was discredited by j g waller in 1960 134 boomer also studied mercury iodine sulfur and phosphorus combinations with helium mercury and iodine helium combinations decomposed around 70 c 136 sulfur and phosphorus helium combinations decomposed around 120 c 136 bismuth dihelide bihe 2 137 138 139 h krefft and r rompe claimed reactions between helium and sodium potassium zinc rubidium indium and thallium 140 references edit cotton f albert wilkinson geoffrey 1966 advanced inorganic chemistry john wiley pp 140 141 1 2 3 4 5 6 7 dong xiao oganov artem r 25 april 2014 stable compound of helium and sodium at high pressure nature chemistry 9 5 440 445 arxiv 1309 3827 bibcode 2017natch 9 440d doi 10 1038 nchem 2716 pmid 28430195 s2cid 20459726 grochala w 1 january 2009 on chemical bonding between helium and oxygen pdf polish journal of chemistry 83 1 87 122 archived from the original abstract on 2 february 2017 retrieved 17 may 2016 1 2 kana an adli s margrave john l 1964 chemical reactions in electrical discharges in emeleus h j sharpe a g eds advances in inorganic chemistry and radiochemistry volume 6 cambridge england academic press pp 182 183 isbn 978 0 08 057855 2 cite book isbn date incompatibility help saleh gabriele dong xiao oganov artem gatti carlo qian guang rui zhu 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