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Page 1

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Two electron pairs around the central atom ­



= Linear




Three electron pairs around the central atom ­




= Trigonal Planar




Four electron pairs around the central atom ­


= Tetrahedral

Page 2

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Five electron pairs around the central atom ­




= Trigonal Bipyramid




Six electron pairs around the central atom ­




= Octahedral




How do you work out the number of electron pairs?
First you need to work out how many electrons there
are around the central atom:
Write down the number…

Page 3

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case of the noble gases which form compounds,
when it will be 8.
Add one electron for each bond being formed
(this allows for the electrons coming from the
other atoms).
Allow for any ion charge. For example, if the ion
has a 1- charge, add one more electron.
Now…

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