This is the CBr4 Lewis structure: Carbon Tetrabromide.
Carbon is in group 4 or 14, so it has 4 valence
electrons.
Bromine in group 7 or 17, so it has 7, and
we have 4 Bromines.
So 4 plus 28 equals 32 total valence electrons.
Carbon, that's the least electronegative,
that'll go in the center; and on the outside
we'll put the Bromine atoms.
We'll put 2 electrons between atoms to form
chemical bonds, and we've used 8.
And then we'll go around the outside and fill
the octets for the Bromine until we've used
32 valence electrons.
So we have 8, 10, 12, and 32.
So we've used all 32 valence electrons.
Each of the Bromines has 8 valence electrons,
and the central Carbon has 8 valence electrons
as well.
So this is the correct structure for CBr4.
This is Dr. B.
