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AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

Dec 15, 2015

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Page 1: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

AS 020 09-Jul-12

Page 2: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

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).

Page 3: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

https://people.ok.ubc.ca/wsmcneil/vsepr.htm

Very useful website (all rotateable)

https://people.ok.ubc.ca/wsmcneil/vsepr.htm
Page 4: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

2 ELECTRON PAIRS

180º

electron pairs

bonding pairs

lone pairs shape

2 2 0 linear

Page 5: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

2 bonding pairs

linear

Page 6: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

3 ELECTRON PAIRS

electron pairs

bonding pairs

lone pairs shape

3 3 0 Trigonal planar

3 2 1 Bent (V-shape)

120º

118º

Page 7: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

3 bonding pairs

Trigonal planar

Page 8: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

2 bonding pair + 1 lone pair

Bent

Page 9: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:
Page 10: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:
Page 11: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

4 electron pairs

tetrahedral

Page 12: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:
Page 13: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

3 electron pairs + 1 lone pair

trigonal pyramid

Page 14: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:
Page 15: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

2 bonding pairs + 2 lone pairs

bent

Page 16: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

4 ELECTRON PAIRS

electron pairs

bonding pairs

lone pairs shape

4 4 0 Tetrahedral

4 3 1 Pyramidal

4 2 2Bent (V-shape)

109.5º

107º

104.5º

Page 17: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

5 ELECTRON PAIRS

electron pairs

bonding pairs

lone pairs shape

5 5 0 Trigonal

bipyramidal

5 4 1

5 3 2

Trigonal planar

or

T-shape

90º120º

89º

119º119º

89ºOR

89º

120º

OR

Page 18: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

5 electron pairs

Trigonal bipyramidal

Page 19: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

4 bonding pairs + 1 lone pair

Seesaw

Page 20: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

3 bonding pairs + 2 lone pairs

T-shape

Page 21: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

6 ELECTRON PAIRS

electron pairs

bonding pairs

lone pairs shape

6 6 0 Octahedral

6 5 1 Distorted

square pyramid

6 4 2 Square planar

90º

89º

90º

Page 22: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

6 electron pairs

octahedral

Page 23: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

5 bonding pairs + 1 lone pairs

square pyramid

Page 24: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

4 bonding pairs + 2 lone pairs

square planar

Page 25: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:
Page 26: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

http://www.lsbu.ac.uk/php-cgiwrap/biology/pfpb.php3?page=http://www.lsbu.ac.uk/biology/biolchem/shapes.html

http://www.lsbu.ac.uk/php-cgiwrap/biology/pfpb.php3?page=http://www.lsbu.ac.uk/biology/biolchem/shapes.html
Page 27: AS 020 09-Jul-12. BASIC IDEAS Shapes of molecules and ions depends on total number of electron pairs around the central atom. Two types of electron pairs:

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