VESPR theory Flashcards
(23 cards)
what is an electron domain geometry
the type of shape that is formed just by how many electron domains there are (based on just the number )
What is molecular geometry
the shape of a molecule based on the influences of different bonds and lone electron pairs around the central atom
what determines a linear VESPR shape
if there are 2 bonding electrons domains on the centeral atom
what determines a trigonal planar shape
when there are three bonding electron domains around the central atom
What determines the tetrahedral VESPR shape
When there is four bonding electron domains
What determines a trigonal bipyramidal VESPR shape
when there are 5 bonding electron domains
What determines a octrahedral VESPR shape
When there are 6 bonding electron domains
What is the general formula for the molecular shape? and what is the meaning of each letter
A X(n) E(n)
- a = central atom
- x= the valence elements (aka the number of bonds to the central atom
- n = number of occurance
- e = the number SINGLE electrons around the central atom (if there is no electrons around the central atom then just elimante the e and just keep formula to AX(n))
what determines if the MG will be different from the EDG
if there is an E in the general formula then the answer will vary
What are all the possiblities for a central molecule with 2 electron domains
it can only be linear
What are the possibilities for a central atom that has three electron domains
- 3 bonds and no non bonding electrons = trigonal planar
- 2 bonds and 1 non bonding electron pair = bent
What are the possibilities for a for a central molecule that has 4 electron domains
- 4 bonds and no non bonding electrons = tetahedral
- 3 bonds and 1 non bonding electron pair = trigonal pyramidal
- 2 bonds and 2 non bonding electron pair = bent
What are the possibilities for a central atom with 5 electron domains
- 5 bonds and no non bonding pairs = trigonal bipyramidal
- 4 bonds and one non bonding pair = see saw
- 3 bonds and two non bonding pairs = T-shape
- 2 bonds and three non bonding pairs = linear
What are the possiblities of a central molecule that has 6 electron bonding domains
- 6 bonds and no non bonding pair = octrahedral
- 5 bonds and 1 non bonding pair = square pyramidal
- 4 bonds and 2 non bonding pairs = square planar
- 3 bonds and 3 non bonding pairs = T - shaped
- 2 bonds and 4 non bonding pairs = linear
What is the bond angle in a linear shape
180 degree
What is the bond angle in a bent shape
119.3 degree
What is the bond angle in a trigonal pyramidal shape
106.7
what is the bond angle in a trigonal planar shape
120
What is the bond angle of a t shaped
86.2
What is the bond angle of a tetrahederal shape
109.5
What is the bond angle of a trigonal bipyramidal
90 degree between the top or bottom atoms
120 degree between one in the same plane
What is the bond angle of a octahederal shape
90 degree between any domain