Predicting Molecular Shapes with Electron Pair Theory

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13 Terms

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Electron Pair Repulsion Theory

Shape determined by outer shell electron pairs.

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Bonded Pair

Electrons shared between atoms in a bond.

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Lone Pair

Non-bonding electron pair on an atom.

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Dative Bond

Bond formed by shared electron pair from one atom.

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Trigonal Planer

Three bonded pairs

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Tetrahedral

Four bonded pairs

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Octahedral

Six bonded pairs

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Linear Shape

Two bonded pairs

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Trigonal Pyramidal

Three bonded pairs

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Non-Linear Shape

Two bonded pairs

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Bond Angle Reduction

Each lone pair reduces angle by 2.5°.

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Double Bond Repulsion

Double bonds repel more than single bonds.

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Bond angle in ammonia molecule

Nh3 have 3 bond pairs and 1 lone pair. Trigonal planer 107*. Electrons repel each other as much as possible. Lone pair repel more than bond pairs