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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.