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Chapter 2. Atomic Structure and Interatomic Bonding

1/14/2011. Chapter 2. Atomic Structure and Interatomic Bonding Interatomic Bonding Bonding forces and energies Primary Interatomic bonds Secondary Bonding Molecules Bonding Forces and Energies Considering the interaction between two isolated atoms as they are brought into close proximity from an infinite separation. At larger distances, the interactions are negligible. As the atoms approach, each exerts forces on the other. Attractive Repulsive Ultimately, the outer electron shells of the two atoms begin to overlap, and a strong repulsive force comes into play.

• The number of covalent bonds that is possible for a particular atom is determined by the number of valence electrons. • Most bonds between two different types of atoms are somewhere in between ionic and covalent. Very few compounds exhibit pure ionic or covalent bonding. •% ionic character ={1-exp[-0.25( - )2 ]}·100 c A c B c

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web.eng.fiu.edu

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