Lewis Structures of Molecular Compounds and Polyatomic Ions

7 Lewis Structures of Molecular Compounds and Polyatomic Ions 

We now tnm to the basic sequence of steps involved in actually writing Lewis structures for given combinations of atoms. 

chemical formulas are written In a way that provides clues to how the atoms are bonded together. For example, CH3OH indicates that three hydrogen atoms and the oxygen atom are bonded to the carbon atom, but the fourth hydrogen atom is bonded to the oxygen atom. 

There are a few exceptions to this ruie, such as diborane (B2He), which contains bridging hydrogens, bnt these are rare and cannot be adeqnateiy addressed by the Lewis modei. 

To write a Lewis structure for a molecular compound, follow these steps  

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Electronegativity and Bond Polarity 394 Lewis Structures of Molecular Compounds and Polyatomic Ions 398 Resonance and Formal Charge 400... 

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