Silicon reacts with chlorine to form the covalent compound SiCl4. Draw a "dot & cross" diagram (showing only valence electron) to show...the...

.     Cl                
Cl

.         0x      
x0

.              
Si

.         0x       x0

.    
Cl                  Cl

In the dot and cross diagram of
SiCl4, the four chlorine atoms which only have one electron in the outermost shell give
the electron to be added to the outermost shell of Si. As Silicon has 4 electrons in the
outermost shell it needs four of these electrons, one coming from each Cl atom, to have
a stable number of eletrons in the valence shell. The final compound is stable as each
of the atoms now has 8 electrons in its valence shell.