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chem week 13

QuestionAnswer
What is the valence bond theory? -chemical bond (covalent) form from overlap of valence orbitals (s+p) -e- pairs move away from each other in 3 dimensions -movement is due to repulsions, minimizes energy of repulsion
What is the steric number? number of bonded atoms + number of lone pairs; 2 to 6
What is the electron pair geometry? Designation for shape given a steric number
What is molecular geometry? Name given for the shape of a molecule, ignoring LPs
What does the A stand for in AXE notation? central atom
What does the X stand for in AXE notation? Number of bonded atoms
What does the E stand for in AXE notation? LPs on center
What is the EP for a steric number of 6? octahedral
What is the MG for AX6? octahedral
What is the MG for AX5E? square-pyramidal
What is the MG for AX4E2? square planar
What is the MG for AX3E3 T-shape
What is the MG for AX2E4? linear
What is the EP for a steric number of 5? Trigonal bipyramidal
What is the MG for AX5? Trigonal bipyramidal
What is the MG for AX4E? See-saw
What is the MG for AX3E2? T-shape
What is the MG for AX2E3? linear
What is the EP for a steric number of 4? Tetrahedral
What is the MG for AX4? tetrahedral
What is the MG for AX3E? trigonal pyramidal
What is the MG for AX2E2? Bent
What is the EP for a steric number of 3? trigonal planar
What is the MG forAX3? Trigonal planar
What is the MG for AX2E? bent
What is the EP for a steric number of 2? linear
What is the MG for AX2? linear
Rules for drawing a 3D structure -draw a valid lewis structure -determine SN -assign AXE -assign EP and MG -draw true to shape
H + Halogen? 1 bond
C + Halogen? 4 bond, 0 LP
N + Halogen? 3 bond, 1 LP
O + Halogen? 2 bond, 2 LP
Created by: c-sneller
 

 



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