Molecular structure and covalent bonding. Chapter 8. Key concepts. Understand the difference between Lewis structures and molecular geometries. Know the basic shapes of several molecule types. Know how to predict molecular shapes using valence-shell electron repulsion (VSEPR) model.
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Lone pair >> multiple bonds > single bonds
suppose I had SF4 instead of
PF5. Where would the lone pair
Lone pairs of trig. bipyrimidal
electronic geometries first occupy
What if we had XeF4 instead
of SF6? Where would the lone
pairs be located?
Two conditions for polarity:
b. lone pairs (if more than one) must not have a geometry that cancels out.
of our examples, which are polar? which are non-polar?