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Chemsheets AS006 (Electron arrangement)

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Presentation on theme: "Chemsheets AS006 (Electron arrangement)"— Presentation transcript:

1 Chemsheets AS006 (Electron arrangement)
20/11/2018 SHAPES OF MOLECULES Chemsheets AS Jun-2015

2 BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs: Bonding pairs (i.e. e-’s in a covalent bond) Non-bonding pairs (i.e. lone pairs) These electron pairs repel as far as possible (but lone pairs repel more than bonding pairs).

3 Very useful website (all rotateable)

4 2 ELECTRON PAIRS electron pairs bonding pairs lone pairs shape 2
linear

5 2 bonding pairs linear

6 3 ELECTRON PAIRS electron pairs bonding pairs lone pairs shape 3
Trigonal planar 2 1 Bent (V-shape)

7 3 bonding pairs Trigonal planar

8 2 bonding pair + 1 lone pair
Bent

9

10

11 4 electron pairs tetrahedral

12

13 3 electron pairs + 1 lone pair
trigonal pyramid

14

15 2 bonding pairs + 2 lone pairs
bent

16 4 ELECTRON PAIRS electron pairs bonding pairs lone pairs shape 4
Tetrahedral 3 1 Pyramidal 2 Bent (V-shape)

17 5 ELECTRON PAIRS electron pairs bonding pairs lone pairs shape 5
Trigonal bipyramidal 4 1 3 2 Trigonal planar or T-shape

18 5 electron pairs Trigonal bipyramidal

19 4 bonding pairs + 1 lone pair
Seesaw

20 3 bonding pairs + 2 lone pairs
T-shape

21 6 ELECTRON PAIRS electron pairs bonding pairs lone pairs shape 6
Octahedral 5 1 Distorted square pyramid 4 2 Square planar

22 6 electron pairs octahedral

23 5 bonding pairs + 1 lone pairs
square pyramid

24 4 bonding pairs + 2 lone pairs
square planar

25

26 http://www. lsbu. ac. uk/php-cgiwrap/biology/pfpb. php3

27

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