Why Don't 5 Si Atoms Bind with Added Phosphorus?

[Entanglement]

Why when phosphorus is added to silicon, phosphorus bind with only four silicon atoms and contributes with its extra electron, why doesn't just phosphorus bind with 5 silicon atoms since that is what it needs ?

 

[mfb]

Look at the lattice structure of silicon: where would the 5th silicon atom be? Is there space for a 5th and how would that atom bond to other atoms?

 

[Entanglement]

Look at the lattice structure of silicon: where would the 5th silicon atom be? Is there space for a 5th and how would that atom bond to other atoms?

That was I thought but I wasn't sure, thanks by the way

 

[Entanglement]

One more question, Are the covalent bonds among the silicon atoms in a lattice considered as intermolecular bonds ?

 

[mfb]

There are no molecules in the lattice, I don't see why you would call bonds there "intermolecular bonds".