101D_FA09_wk05_doc1

101D_FA09_wk05_doc1 - 101D week 5, doc 1 Section Day, Time:...

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101D week 5, doc 1 Section Day, Time: Thursdays, 1-3PM Team: Plutonium Manager: Shomaila Shaikh Blogger: Marcus Garcia Scribe: Ashly McClure Researcher: Shomaila Shaikh Polar, Nonpolar and Ionic Bonds ~ Let’s play nice and try to share electrons. ~ GOALS Understand the concept of electronegativity Understand the concept of bonds between elements SKILLS Be able to identify and/or assign bond type Ionic and Covalent Bonds A chemical bond is an attractive force that holds atoms together in compounds or polyatomic ions. There are two major classes of bonds. Ionic bonds result from electrostatic interactions among ions, which often result from the net-transfer of one or more electrons from one atom or group of atoms to another. Covalent bonds result from sharing one or more electron pairs between atoms. These two classes represent two extremes; all bonds between atoms of different elements have at least some degree of both ionic and covalent character. Electronegativity In 1937, Linus Pauling examined bonds between homonuclear diatomic molecules (such as H 2 and Cl 2 ) and bonds in heteronuclear diatomic molecules (such as HCl). Bonds between different elements appeared to be stronger. He proposed that the bonding electrons in heteronuclear molecules were not shared equally. That is, he reasoned that in heteronuclear molecules one atom attracted the electrons in the bond more strongly than the other atom. Pauling called the ability of an atom within a molecule to attract electrons the electronegativity (EN) of the atom. He devised a quantitative scale for electronegativity in which fluorine was assigned the highest value.
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Table I: Pauling electronegativity values of the main group elements Electronegativity 1. Describe the trend in electronegativity moving from left to right across a period of the periodic table. Increases from left to right
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This note was uploaded on 07/10/2011 for the course CHEM 101 taught by Professor Taracarpenter during the Fall '08 term at UMBC.

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101D_FA09_wk05_doc1 - 101D week 5, doc 1 Section Day, Time:...

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