Valence Shell Electron Pair Repulsion Theory (copy)
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25 Terms
1
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what are shapes defined by?
their bond angles
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linear
180 degrees
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trigonal planar
120 degrees
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tetrahedral
109.5 degrees
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How are electron pairs arranged?
they are arranged symmetrically with maximum separation since negative charges repel
6
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if there are 2 electron pairs...
they are 180 degrees apart and have a linear geometry
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if there are 3 electron pairs...
they are 120 degrees apart and have a triangular planar geometry
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if there are 4 electron pairs...
they are 109.5 degrees apart and have a tetrahedral geometry
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if there are 5 electron pairs...
angles of 90 and 120 degrees and have a trigonal bipyramidal (TBP) geometry
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if there are 6 electron pairs...
they have 90 degree angles and have a octahedral geometry
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What is an electron pair of geometry
the arrangement of electron pairs around a central atom
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what is molecular geometry
arrangement of atoms around a central atom
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when all electrons pairs are bonding pairs...
electron pair of geometry = molecular geometry
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when there are unshared or lone electron pairs...
electron pair of geometry does not equal molecular geometry
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AXnEe notation values definitions
A = central atom
Xn = number of ligands (atoms) attached to the central atom
E = non-bonding electron pairs
e = number of lone eelctrons
Xn = number of ligands (atoms) attached to the central atom
E = non-bonding electron pairs
e = number of lone eelctrons
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2 bonding pairs and 1 non-bonding
electron pair geometry: trigonal planar
molecular geometry: bent
angle: 104.5
molecular geometry: bent
angle: 104.5
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3 bonding pairs and 1 non-bonding
electron pair geometry: tetrahedral
molecular geometry: trigonal planar
angle: 107
molecular geometry: trigonal planar
angle: 107
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2 bonding with 2 non-bonding
electron pair geometry: tetrahedral
molecular geometry: bent
angle: 104.5
molecular geometry: bent
angle: 104.5
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4 bonding with 1 non-bonding
electron pair geometry: trigonal bipyramidal
molecular geometry: seesaw
angle: 90 and 120
molecular geometry: seesaw
angle: 90 and 120
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3 bonding with 2 non-bonding
electron pair geometry: trigonal bipyramidal
molecular geometry: T-shape
angle: 90
molecular geometry: T-shape
angle: 90
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2 bonding with 3 non-bonding
electron pair geometry: trigonal bipyramidal
molecular geometry: linear
angle: 180
molecular geometry: linear
angle: 180
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5 bonding with 1 non-bonding
electron pair geometry: octahedral
molecular geometry: square pyramid
angle: less than 90
molecular geometry: square pyramid
angle: less than 90
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4 bonding 2 non-bonding
electron pair geometry: octahedral
molecular geometry: square planar
angle: 90
molecular geometry: square planar
angle: 90
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3 bonding with 3 non-bonding
electron pair geometry: octahedral
molecular geometry: T-shape
angle: less than 90
molecular geometry: T-shape
angle: less than 90
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2 bonding with 4 non-bonding
electron pair geometry: octahedral
molecular geometry: linear
angle: 180
molecular geometry: linear
angle: 180