My textbook says that "sometimes, as in the special case of benzene, three of the four outer-shell electrons from each carbon atom form normal covalent bonds but the fourth electron is shared (delocalised) around the six-membered carbon ring." It only has benzene represented by C's, H's and lines, with a circle and with three lines inside two hexagons with a double-headed arrow in between.
Can someone please show me how three of the four outer-shell electrons form normal covalent bonds?
TIA,
xtheunknown0