SHAPES OF MOLECULES Flashcards
What is (Valence Shell) Electron Repulsion theory?
Electrons are negatively charged which makes pairs of electrons repel away from each other. The repulsion of pairs determine the shape of a molecule.
Which type of electron pair repels more and why?
-Lone pairs.
-Due to being slightly closer to the central atom and having a more concentrated electron charge cloud.
What’s the order of repulsion for electron pairs?
-((From least repelling to most))
-Bonded-pair/bonding pair
<Bonded-pair/lone-pair
<Lone-pair/lone-pair
Which type of electron pair decreases the angle of the shape?
Lone pairs
What’s the name of the shape that has a 109.5 bond angle?
Tetrahedral
How many lone pairs do Tetrahedral molecules have?
None.
What’s the name of the shape that has a bond angle of 107?
Pyramidal
How many lone pairs does a Pyramidal molecule have?
One lone pair.
What’s the name of the shape that has a bond angle of 104.5?
Non-linear
How many lone pairs does a non-linear molecule have?
Two lone pairs.
What’s an example of a non-linear molecule?
H2O/Water
What’s an example of a tetrahedral molecule?
Methane/CH4
What’s an example of a pyramidal molecule?
Ammonia/NH3
What’s the name of the shape that has a bond angle of 180?
Linear.
How many bonding regions does a linear molecule have?
2 bonding regions.
