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Total number of electron pairs dictate shape due to repulsion between bonding/ lone pairs.
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Each lone pair on a molecule reduces bond angle by 2.5 degrees celsius.



2 bonding pairs
3 bonding pairs
2 bonding pairs
& 1 lone pair


3 bonding pairs
& 1 lone pair

4 bonding pairs

2 bonding pairs
& 2 lone pairs




5 bonding pairs
4 bonding pairs 3 bonding pairs 2 bonding pairs
& 1 lone pair & 2 lone pairs & 3 lone pairs



6 bonding pairs
4 bonding pairs & 2 lone pairs
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