What is the orientation of the two unhybridized p orbitals on be with respect to the two be-f bonds?

Each sp2 hybrid orbital on a carbon atom contains one electron. Figure 9.21 shows how the four C H bonds are formed by overlap of sp2 hybrid orbitals on C with the 1 s orbitals on each H atom. We use eight electrons to form these four electron-pair bonds. The C C bond is formed by the overlap of two sp2 hybrid orbitals, one on each carbon atom, and requires two more electrons. The C 2H4 molecule has a total of 12 valence electrons, 10 of which form the one C C and the four C H bonds.