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1	Chapter 5 Chemical Bonding: The Covalent Bond Model
2	What’s the fuel in space shuttle?
3	Hydrogen molecule: A covalent bond Fig. 5.1 Electron sharing can occur only when electron orbitals from two different atoms overlap.
4	Number of covalent bonds and Lewis symbol Fig. 5.2 The number of covalent bonds formed by a nonmetallic element is directly correlated with the number of electrons it must share in order to obtain an octet of electrons.
5	Covalent and Coordinate covalent Bond Fig. 5.3 (a) A “regular” covalent single bond is the result of overlap of two half-filled orbitals. (b) A coordinate covalent single bond is the result of overlap of a filled and a vacant orbital.
6	Molecular structure Fig. 5.4 The sulfur dioxide molecule.
7	Pyramidal molecule Fig. 5.5 The phosphorus trifluoride molecule.
8	Linear Molecule Fig. 5.6 The hydrogen cyanide molecule.
9	Unpaired electrons
10	Polyatomic ions held by covalent bonds Fig. 5.7 The sulfate ion.
11	Electron pair repulsions Fig. 5.8 Arrangement of valence electron pairs about a central atom that minimize repulsions between the pairs.
12	Where you find covalent molecules?
13	Space filling models Fig. 5.9 (a) Acetylene molecule. (b) Hydrogen peroxide molecule. (c) Hydrogen azidde molecule.
14	VSEPR theory and molecular geometry
15	Linus Pauling and Electronegativity Fig. 5.10 Linus Pauling received the Nobel Prize in chemistry in 1954 for his work on the nature of the chemical bond.
16	Electronegativity Trends Fig. 5.11 Abbreviated periodic table showing Pauling electronegativity values for selected representative elements.
17	Polarity in heteonuclear diatomic molecules Fig. 5.12 (a) In the nonpolar covalent bond present, there is a symmetrical distribution of electron density. (b) In the polar covalent bond present, electron density is displaced because of its electronegativity.
18	Types of covalent bond
19	Predicting polarity of molecule Fig. 5.13 (a) Methane is a nonpolar tetrahedral molecule. (b) Methyl chloride is a polar tetrahedral molecule.
20	Prefixes for naming covalent compounds Table 5.1
21	Common names of covalent compunds Table 5.2
22	Naming covalent compounds Fig. 5.14 The tetraphosphorous decoxide molecule.