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What determines molecular shape?
· Electron pairs around the central atom.
· Lone pairs of electrons are electrons that are not
shared.
· Bonding pairs of electrons are electrons that are
shared with another atom in a covalent bond.
· Electron pairs repel each other.
· The molecular shape results from the electron
pairs arranging themselves to be are as far apart
from each other as possible. They minimise
mutual repulsion…read more

Slide 3

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What is the electron-pair repulsion
theory?
· Electron pairs repel each other because all
electrons are negatively charged.
· Lone pairs repel more than bonding pairs.
· Each lone pair reduces the bond angles by 2.5
degrees.…read more

Slide 4

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What are linear molecules?
· 2 electron pair on the central atom.
· Bond angle of 180 degrees.
· E.g. BeCl2 and CO2…read more

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What are trigonal planar molecules?
· 3 electron pairs on the central atom.
· No lone pairs.
· Bond angle of 120 degrees.
· E.g. BCl3, CO32- and NO3-…read more

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What are `bent'/non-linear molecules?
· Molecules with two bonding pairs of electrons
and one or more lone pairs of electrons.
· Bond angle = bond angle for number of
electron pairs on the central atom ­ 2.5
degrees for every lone pair.
· E.g. SO2 and H2O…read more

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Comments

Venu

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lovebiology101

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