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Slide 2

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Electron-pair repulsion theory
· The number of electrons in the
outer shell determines the shape
of the molecule
· Electrons have a negative charge
so each electron pair repeals
other electron pairs.…read more

Slide 3

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Molecules with bonded pairs
· Dot and cross diagrams are used
to show the number of electrons
in the outer shell.
· Each bonded pair is repelled
as far as possible from other
bonded pairs.…read more

Slide 4

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Shape and bond angles…read more

Slide 5

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Molecules with lone pairs
· Lone pairs repel more than bonded
pairs because they are slightly more
electron-dense.
· Each lone pair reduces the bond
angle by about 2.5° which is due to
the extra repulsive effects of each
lone pair.…read more

Slide 6

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Molecules with double bonds
· A double bond has four electrons
as two bonded pairs
· Each double bond is treated as a
bonded region in the same way
as aO O
bonded pair. O
O
X X
O O C O O
X X
O O
O 180°
O
OO…read more

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