SHAPES OF MOLECULES Flashcards
1
Q
What is electron pair repulsion theory
A
The shape of a molecule is determined by the electron pair surrounding the central atom.Only refers to outer shells
2
Q
Different number of electron pairs
A
means differnt shape
3
Q
Bond angle is reduced by
A
2.5’ per lone pair
4
Q
CH4
A
Tetrahedral 109.5
5
Q
NH3
A
Pyramidal 107’
6
Q
H20
A
non-linear 104.5
7
Q
lone pairs are more repulsive than
A
bonding pairs as a result of being closer to the nucleus of an atom
8
Q
2 electron pairs
A
Linear.180’
9
Q
3 pairs
A
Trigonal planar .120’
10
Q
4 pairs
A
tetrahedral.109.5’ and 109’
11
Q
5 pairs
A
Triangular bipyramid.90’ and 120’
12
Q
6 pairs
A
Octahedral.90’
13
Q
shapes of molecules steps
A
- Draw the dot and cross diagrams
- look at your outer shell electron pairs
- count the pairs
- use the pairs to determine angle and shape
14
Q
3 bonded pairs and 1 lone pair
A
-Pyramidal
107.
15
Q
what does the number at the bottom tell you
A
the atoms and what shape and angle it could be
