Shapes of molecules Flashcards
1
Q
How do you calculate the shape of a molecule?
A
- what is the central atom
- which group on the periodic table is it in?
- how many bonds does it make?
- does it have any electrons/charge?
- bonds + e-
- divide by 2
- ans = number of e- pairs
2
Q
2 bond pairs
no lone pairs
A
bong angle = 180°
shape = linear
3
Q
3 bond pairs
no lone pairs
A
120°
trigonal planar
4
Q
4 bond pairs
no lone pairs
A
109.5°
tetrahedral
5
Q
5 bond pairs
no lone pairs
A
120° & 90°
trigonal bipyramid
6
Q
6 bond pairs
no lone pairs
A
90°
octahedral
7
Q
linear
no lone pairs
A
2 bond pairs
180°
8
Q
trigonal planar
no lone pairs
A
3 bond pairs
120°
9
Q
tetrahedral
no lone pairs
A
4 bond pairs
109.5°
10
Q
trigonal bipyramid
no lone pairs
A
5 bond pairs
120° & 90°
11
Q
octahedral
no lone pairs
A
6 bond pairs
90°
12
Q
for each lone pair you subtract (….) from the bond angle
A
2.5°
13
Q
2 bond pairs
1 lone pair
A
118°
bent OR non linear
14
Q
3 bond pairs
1 lone pair
A
107°
trigonal pyramid
15
Q
2 bond pairs
2 lone pairs
A
104.5°
bent OR non linear
