Lecture 26 - CHemical Bonding

Lecture 26 - CHemical Bonding - Lec 26 Lec-26 Chemical...

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Lec-26: Chemical Bonding Lec 26: Chemical Bonding Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 1 Quantum numbers Chemical bonds result from the attractive interactions which holds atoms together in molecules and compounds. Atoms may transfer or share electrons, and either process may provide for a stable arrangement of electrons between the atoms that results in the formation of molecules. Ionic Bonds, Covalent Bonds, and Metallic Bonds. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 2 Oct 31, 2011
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Bond types Formed from electrostatic attractions of closely packed, Formed when an atom that reacts high ` When a nonmetal and a metal react ,the valence orbitals of the metal are emptied to achieve noble gas electron configuration. The valence orbitals of the nonmetal gains electrons to achieve a noble gas electron configuration. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 3 Bond types ` : They share electrons to achieve Noble Gas Electron configuration. configuration. Ń If the electrons are shared equally, a covalent bond is formed formed. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 4 2-1 2-2
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Bond types A metallic bond consists of the nuclei of metal atoms surrounded by a “sea” of 3 3+ 3 3+ 3 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ 3+ Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 5 Favored electron configurations Noble gas electron configurations are favored Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 6 3-1 Because they are stable
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Lewis Theory of Bonding ` Atoms form bonds by sharing electrons. Through the sharing process, each atom acquires enough electrons to mimic the electron acquires enough electrons to mimic the electron configuration of a noble gas. ` An octet is a set of 8 electrons in the ` The outermost shell of hydrogen can contain a maximum of 2 electrons, called a duet. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 7 Lewis Symbols Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 8 4-1 Valence Electrons
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Ionic Bonding In an IONIC bond, electrons are lost or gained, resulting in the formation of IONS i i i d in ionic compounds .
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