PLEASE HELP!! MEDAL!!
Draw the Structural Formulas for the following covalently bonded molecules.

Question

PLEASE HELP!! MEDAL!!
 Draw the Structural Formulas for the following covalently bonded molecules.

clamin · Answer

$$CBr _{4} ,        SeO _{4}^{-2}$$

photon336 · Answer

I guess this is what you mean 

CBr4 This one is not bad. 

Okay so let's look at this. We always put the least electronegative element in the center of our figure and that's carbon. Bromine is more electronegative than carbon. 

Then we draw the lewis dot structures. 

carbon has 4 valence electrons, which means it needs 4 electrons to fill its octet 8 electrons) and it does this by forming a bond with each of the bromine atoms. 

|dw:1453345948563:dw|

now that's for the lewis structure. let's draw out how this would actually look. Our carbon atom in the center would be Sp3 hybridized., it has 4 atoms bonded to it and there are no lone pair electrons. so the molecular carbon uses all 4 of its orbitals to make bonds. 

here's what it would look like. 

|dw:1453346031769:dw|