Shapes of molecules and ions Flashcards
How many shape names are there (main ones)?
There are 5 shape names
What are the 6 main shape names?
- Linear shape
- Trigonal planar
- Tetrahedral
- Trigonal bipyramid
- Octahedral
How can you predict the shape of a simple covalent molecule?
You can predict by the number of electrons around an atom. Each pair of electrons will repel all the other electron pairs. Therefore they will take positions as far apart as possible to minimise repulsion
What is the positioning of electrons far apart and repulsion between electrons referred to as? (theory)
The electron repulsion theory
What does the shape of a molecule depend on?
The shape of a molecule depends on the number of pairs of electrons surrounding the central atom
What is the shape name of a molecule with two electron pairs?
If the shape has two electron pairs how many ELECTRONS does the shape have?
The shape name given to a molecule with two electron pairs would be a LINEAR shape
There are four electrons within this shape type
What is the bond angle of a LINEAR shape?
180 degrees
What is are a few examples of linear shaped molecules
Carbon dioxide
Beryllium chloride
Beryllium fluoride
What is the shape name of a molecule with three electron pairs?
If the shape has three electron pairs how many ELECTRONS does the shape have?
The shape name given to a molecule with three electron pairs would be a TRIGONAL PLANAR shape
There are 6 electrons within this shape type
What is the bond angle of a TRIGONAL PLANAR shape?
120 degrees
What are a few examples of trigonal planar shaped molecules?
Boron trifluoride
Formaldehyde
Phosgene
Sulphur trioxide
Nitrate
Carbonate
Guanidinium
What is the bond angle of a TETRAHEDRAL shape?
109.5 degrees
What are a few examples of a tetrahedral shaped molecule?
Methane
Phosphate
Sulfate
Permanganate
Ammonium
What is the shape name of a molecule with four electron pairs?
If the shape has 4 electron pairs how many ELECTRONS does the shape have?
The shape name given to a molecule with four electron pairs would be a TETRAHEDRAL shape
There are 8 electrons within this shape
What is the shape name of a molecule with 5 electron pairs?
If the shape has 5 electron pairs how many ELECTRONS does the shape have?
The shape name given to a molecule with five electrons pairs would be a TRIGONAL PLANAR shape
There are 10 electrons within this shape