Asked by jay

why does BeCl2 have low melting point but SiO4 has high melting point even though they are both covalent bonds between the atoms
Answered by DrBob222
SiO4?
Answered by jay
I mean why are their bonds different? why does Becl2 form covalent molecule and SiO4 a covalent network solid?
Answered by Olereb48
BeCl2 has a linear crystalline molecular geometry with bond angle of 180-deg. X-A-X geometry by the VSEPR Theory and SiO4 is a tetrahedral molecular geometry with 104.5-degree bond angles with an AX4 geometry. SiO4 can not form closely packed molecular solids b/c of its geometry as can BeCl2.
Search molecular geometry of BeCl2 and SiO4 on internet. I'm sure you'll find some images to compare.
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