| LEWIS
ELECTRON-DOT SYMBOLS AND STRUCTURES |
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Lewis electron-dot symbols for
atoms and monoatomic ions |
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Definition |
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Conventions |
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Examples |
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Lewis electron-dot structures for
molecules and polyatomic ions |
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Definition |
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The octet rule |
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Guidelines for drawing Lewis electron-dot
structures for molecules and polyatomic ions – the “Bucket Method” |
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Examples |
| METALLIC
BONDING |
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Definition |
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Responsible for properties of
metals |
| IONIC
BONDING |
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Definition |
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Electron configuration of ions |
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Using Lewis electron-dot structures
to describe ionic bonding |
| COVALENT BONDING |
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Covalent bond |
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Definition |
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Using Lewis electron-dot structures to describe
covalent bonding |
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Coordinate covalent bond |
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Definition |
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Once formed, indistinguishable |
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Shown as an arrow |
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Using Lewis electron-dot structures to describe
coordinate covalent bonding |
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Bond
order and the types of covalent bonds described |
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Definition |
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Bond orders and their type of bond |
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Bond length |
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Depends on bond order |
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Examples |
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Delocalized bonding and resonance
bonding |
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Definitions |
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Delocalized bonding |
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Resonance description |
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Resonance bonding |
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Resonance forms |
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The mule: a model for resonance |
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Examples |
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Exceptions to the octet rule |
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Odd number of electrons |
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Central atom has fewer than eight electrons |
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Central atom has more than eight electrons |
| BOND TYPES ACCORDING TO
ELECTRONEGATIVITY |
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Ionic bonds |
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Descriptions |
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Definition |
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E.D. equal to or greater than 2.0 |
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Polar covalent bonds |
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Description |
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E.D. greater than 0.4 and less than 2.0 |
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Polar molecules contain one or more polar
covalent bonds |
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Nonpolar covalent bonds |
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Descriptions |
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E.D. equal to or less than 0.4 |
| FORMAL
CHARGE AND LEWIS STRUCTURES |
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Definition |
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Description |
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Rules for assigning electrons to
calculate the formal charge on an atom |
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Calculating the formal charge on an
atom |
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Determining which Lewis
electron-dot structure is best if more than one is possible |