VSPER Theory

Question 0

Triatomic linear

Answer 0

• Occurs if there are no unshared electrons in the center
• double bonds between the two electrons
Ex: CO2
180 degrees

Question 1

Diatomic linear

Answer 1

All mandatory diatomic elements
Ex: Br2
180 degrees

Question 2

Bent

Answer 2

• 3 elements in question
• center element has 2 unshared bonds
104.5 degrees

(Center element has no unshared bonds, the bond angle = 118 degrees)

Question 3

Trigonal pyramidal

Answer 3

• four elements
• central element has 2 unpaired electrons
107.5 degrees

Question 4

Trigonal planar

Answer 4

• Exception to the octet rule
• central element has no non bonding pairs
120 degrees

Question 5

Tetrahedral

Answer 5

• 5 atoms
• 4 shared bonds
109.5 degrees

Question 6

VSEPR

Answer 6

Valence shell electron pair repulsion