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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:

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Presentation on theme: "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:"— Presentation transcript:

1 AS Jul-12

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

4 2 ELECTRON PAIRS electron pairs bonding pairs lone pairsshape 220linear

5 2 bonding pairs linear

6 3 ELECTRON PAIRS electron pairs bonding pairs lone pairsshape 330Trigonal planar 321Bent (V-shape)

7 3 bonding pairs Trigonal planar

8 2 bonding pair + 1 lone pair Bent

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11 4 electron pairs tetrahedral

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13 3 electron pairs + 1 lone pair trigonal pyramid

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15 2 bonding pairs + 2 lone pairs bent

16 4 ELECTRON PAIRS electron pairs bonding pairs lone pairsshape 440Tetrahedral 431Pyramidal 422Bent (V-shape)

17 5 ELECTRON PAIRS electron pairs bonding pairs lone pairsshape 550 Trigonal bipyramidal 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 pairsshape 660Octahedral 651 Distorted square pyramid 642Square planar

22 6 electron pairs octahedral

23 5 bonding pairs + 1 lone pairs square pyramid

24 4 bonding pairs + 2 lone pairs square planar

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