Posted by PInk Floyd on Thursday, April 2, 2009 at 10:58pm.
Be is in group II and it has two electrons; therefore, addition of two H atoms makes H:Be:H (although Be doesn't have an octet in this structure) so it has two regions of high electron density (sp hybridization) and that is a linear molecule. Oxygen is in group VI, it has six electrons, H2O has 4 regions of high electron density which makes the electronic geometry tetrahedral (sp3 hybridization). The two sets of unshared electrons makes it a distorted tetrahedron so the molecular geometry is bent.
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