why h2 molecule exist but not he2? explain why he2 does not exist but he2+ and he2- exist.
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H₂ is formed due to combination of two hydrogen atoms. Atomic number of hydrogen is 1 .
Hence it’s electronic configuration is 1s¹.According to valence bond theory,halfilled atomic orbitals can overlapp to form a bond.Thus two hydrogen atoms along with halffilled 1s orbital,overlapp with each other to form H₂ molecule. H₂ is formed dew to s-s overlapp.
Whereas atomic number of helium is 2 .It’s electronic configuration is 1s².Filled orbital can not overlapp and hence cannot form a bond.Hence diatomic helium i.e.He₂ molecule does not exist.
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