Only FCC(face centered cubic)has this many atoms per unit cell 6.(a)Name four physical properties of molecules that can be predicted using molecular orbital theory that can not be predicted using valence bond theory or hybrid orbital theory. 1.Bond length 2.Bond energy 3.Magnetic properties 4.Ionization potentials (c)Describe the bonding between the two carbon atoms in a molecule of acetylene,C2H2,in terms of the hybrid and other orbitals used by each atom,and by the types of bonds that result. The carbon atoms are bound by: 1.A sigma bond,formed by overlap of an sp hydrib orbital on one carbon with an sp hybrid orbital on the other carbon. 2.A pi bond,formed by the sideway overlap of two parallel p-orbitals,one on each carbon atom 3.Another pi bond,formed by the sideway overlap of the other two parallel p-orbitals,one on each carbon atom. 77 Only FCC (face centered cubic) has this many atoms per unit cell. 6. (a) Name four physical properties of molecules that can be predicted using molecular orbital theory that can not be predicted using valence bond theory or hybrid orbital theory. 1. Bond length 2. Bond energy 3. Magnetic properties 4. Ionization potentials (c) Describe the bonding between the two carbon atoms in a molecule of acetylene, C2H2, in terms of the hybrid and other orbitals used by each atom, and by the types of bonds that result. The carbon atoms are bound by: 1. A sigma bond, formed by overlap of an sp hydrib orbital on one carbon with an sp hybrid orbital on the other carbon. 2. A pi bond, formed by the sideway overlap of two parallel p-orbitals, one on each carbon atom 3. Another pi bond, formed by the sideway overlap of the other two parallel p-orbitals, one on each carbon atom