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Valence shell electron pair repulsion theory
·The idea that electron pairs repel each other and move as far as they can from each
other in order to minimise repulsions
·Not all electron pairs are shared during bonding- these are known as lone pairs
·The pairs of electrons that are shared/involved in bonding are called bonding pairs
·If a molecule consist of bonding pairs and no lone pairs the molecule is symmetrical
·If lone pairs are present, symmetrical shape is distorted…read more

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A Molecule that consists of a central atom surrounded by two atoms has a
linear shape, with bond angle of 180 degrees.
·It arranges itself in a linear shape so the electron pairs within the bonds are as far
away as possible.
·Double bonds do not effect the shape. E.g. Carbon dioxide consists of a carbon
atom surrounded by two oxygen atoms that have double bonds with the carbon
atom, yet it is still a linear molecule.…read more

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A Molecule that consists of a central atom surrounded by three atoms has a
trigonal planer shape, with bond angle of 120 degrees.
·It arranges itself in a trigonal planer shape so the electron pairs within the
bonds are as far away as possible.…read more

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A Molecule that consists of a central atom surrounded by four atoms has
tetrahedral shape, with bond angle of 109.5 degrees.
·It arranges itself in a tetrahedral shape so the electron pairs within the
bonds are as far away as possible.…read more

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