Chemsheets AS006 (Electron arrangement)

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Presentation transcript:

Chemsheets AS006 (Electron arrangement) 20/11/2018 www.CHEMSHEETS.co.uk SHAPES OF MOLECULES Chemsheets AS 1025 07-Jun-2015

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).

Very useful website (all rotateable) https://people.ok.ubc.ca/wsmcneil/vsepr.htm

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

2 bonding pairs linear

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

3 bonding pairs Trigonal planar

2 bonding pair + 1 lone pair Bent

4 electron pairs tetrahedral

3 electron pairs + 1 lone pair trigonal pyramid

2 bonding pairs + 2 lone pairs bent

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

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

5 electron pairs Trigonal bipyramidal

4 bonding pairs + 1 lone pair Seesaw

3 bonding pairs + 2 lone pairs T-shape

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

6 electron pairs octahedral

5 bonding pairs + 1 lone pairs square pyramid

4 bonding pairs + 2 lone pairs square planar

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