▁the ▁noble ▁gas ▁atoms ▁around ▁the ▁equ ator . ▁▁ ▁can ▁bind ▁up ▁to ▁five ▁noble ▁gas ▁atoms ▁in ▁a ▁ring ▁around ▁a ▁linear ▁O == O ▁core . ▁These ▁mole cules ▁are ▁produced ▁when ▁u ran ium ▁metal ▁is ▁las er ▁ab l ated ▁into ▁dio xygen . ▁This ▁produces ▁U O , ▁U O 2 , ▁U O 3 , ▁U + , ▁and ▁important ly ▁. ▁ ▁is ▁then ▁cond ensed ▁into ▁a ▁noble ▁gas ▁matrix , ▁either ▁a ▁pure ▁element ▁or ▁a ▁mixture . ▁He avier ▁noble ▁gas ▁atoms ▁will ▁tend ▁to ▁dis place ▁the ▁l ighter ▁atoms . ▁I onic ▁mole cules ▁produced ▁this ▁way ▁include ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁, ▁and ▁, ▁which ▁are ▁identified ▁by ▁a ▁shift ▁in ▁the ▁U = O ▁ant is ym metric ▁stretch ing ▁frequency . ▁ ▁Ne ut ral ▁U O 2 ▁cond ensed ▁in ▁solid ▁arg on ▁is ▁converted ▁from ▁one ▁electronic ▁state ▁to ▁another ▁by ▁the ▁arg on ▁atom ▁lig ands . ▁In ▁arg on ▁the ▁electron ▁configuration ▁is ▁ 5 f 2 ( δ φ ) ▁whereas ▁in ▁ne on ▁it ▁is ▁ 5 f 1 7 s 1 ▁( the ▁state ▁ 3 H 4 g ▁compared ▁to ▁ 3 Φ 2 u ). ▁This ▁is ▁because ▁the ▁arg on ▁atoms ▁have ▁a ▁larger ▁ant ib ond ing ▁interaction ▁with ▁the ▁ 7 s 1 ▁electron , ▁forcing ▁it ▁into ▁a ▁different ▁sub shell . ▁The ▁arg on ated ▁comp