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• Electronegativity—the attractive force that an atomic nucleus exerts on electrons • It depends on the number of protons and the distance between the nucleus and electrons. 11 ELECTRONEGATIVITIES CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES
• If two atoms have similar electronegativities, they share electrons equally, in what is called a nonpolar covalent bond.
• If atoms have different electronegativities, electrons tend to be near the most attractive atom, in what is called a polar covalent bond 12 ELECTRONEGATIVITY COVALENT BOND VS. IONIC BOND 13 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES
• Attraction between the δ– end of one molecule and the δ+ hydrogen end of another molecule forms hydrogen bonds.
• They form between water molecules.
• They are important in the structure of DNA and proteins. Figure 2.5 Hydrogen Bonds Can Form between or within Molecules 14 CONCEPT 2.2 ATOMS INTERACT AND FORM MOLECULES
• Water molecules form multiple hydrogen bonds with each other—this contributes to high heat capacity. CONCEPT 2.2 ATOMS INTERACT AND F...
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This note was uploaded on 01/31/2014 for the course BSC 2010 taught by Professor Bowes during the Winter '08 term at University of Florida.
- Winter '08