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Unformatted text preview: nt bond: sharing of electrons between two nonmetal atoms polar covalent bond: unequal sharing of electrons by 2 atoms with different EN values – Electron density is concentrated towards the more electronegative atom. nonpolar covalent bond: equal sharing of electrons by two atoms with equal EN – Electron density is evenly distributed between the two atoms. Use delta notation (δ+ and δ−) and a dipole arrow to indicate which atom in a bond is more electronegative page 1 of 4 Chapter 10 (Continued) coordinate covalent bond: a covalent bond in which one atom donated the pair of electrons that are shared to make the bond If the electronegativity difference between two atoms is large, electrons are transferred rather than shared → ions → ionic compound. Metallic Bond: ‐ Metals exist as nuclei in a “sea of electrons”. → The electrons in a metal are delocalized (free to move around the entire substance). → The special properties of metals (heat and electrical conductivity, malleable and ductile qualities, etc.) result from electrons’ freedom to move around Be able to identify a bond as ionic, metallic, polar covalent, or nonpolar covalent. octet rule: atoms bond such that each has 8 electrons, except H only needs 2 electrons. Bond Length and Bond Strength ‐ The shorter the bond, the stronger the bond. ‐ Single bonds are longer and weaker than double bonds. ‐ Double bonds are longer and weaker than triple bonds. Draw the Lewis Structure for Molecules and Polyatomic Ions 1. Count total number of valence electrons, then divide by 2 to get # of electron pairs. – Account for the electrons gained/lost for the charge in polyatomic ions 2. Draw the skeleton structure – The central atom will be indicated. – Know that H and F are always outer atoms. 3. Connect all the atoms by drawing lines to represent single bonds – Distribute remaining electrons around outer atoms then central atom until each has octet. – Make double or triple bonds only if an atom does not have an octet. 4. For polyatomic ions, put square b...
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This document was uploaded on 03/22/2014 for the course CHEM 12 at Seattle Central Community College.

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