1. Chemical Bonds

2. Learning Objectives
Understand what a covalent bond is and what an ionic bond is and how they are different

3. Ionic Bond
Between atoms of metals and nonmetals with very different electronegativity
Bond formed by transfer of electrons
Produce charged ions all states. Conductors and have high melting point.
Examples; NaCl, CaCl2, K2O

5. Ionic Bonds: One Big Greedy Thief Dog!

6. Continuous Ionic Crystals

7. COVALENT BOND bond formed by the sharing of electrons of close electronegativity <0.7

8. Figure 12.3: Electronegativity values for selected elements.
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9. Covalent Bond
Between nonmetallic elements of similar electronegativity.
Formed by sharing electron pairs
Non-metals to non-metals
Examples; O2, CO2, C2H6, H2O, SiC

10. Covalent Bonds

11. 2. Covalent bonds- Two atoms share one or more pairs of outer-shell electrons.
Oxygen Atom
Oxygen Atom
Oxygen Molecule (O2)

12. Covalent Bonds: Willing to share.