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5.2 <strong>Covalent</strong> Bonds and the<br />
Periodic Table<br />
<strong>Covalent</strong> <strong>bond</strong>s can form between unlike atoms as<br />
well as between like atoms, making possible a vast<br />
number of molecular compounds.<br />
Water molecule, H 2O, O, consists of two hydrogen<br />
atoms joined by covalent <strong>bond</strong>s to one oxygen<br />
atom.<br />
Ammonia molecule, NH 3, , consists of three<br />
hydrogen atoms joined by covalent <strong>bond</strong>s to one<br />
nitrogen atom.<br />
In most covalent molecules, each atom shares<br />
enough electrons to achieve a noble gas<br />
configuration.<br />
Prentice Hall © 2003 Chapter Five 11
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