Make MO's: First bond H and Be Next bond H and BeH to form BeH to form BeH2 O* O* n 2p 1s 1s 2s H+BeH←一 Be BeH→BeH2—H The MO's for BeH,are complicated and hard to work with. X-4H BeH Be 2s 1s 2p σ* πn σb σb BeH 1s σ* σb σb πn σ* πn σ* σb BeH2 H Make MOʼs: First bond H and Be to form BeH Next bond H and BeH to form BeH2 The MOʼs for BeH2 are complicated and hard to work with. X-4