Unit 1 Topic 3 ✓
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What is a Dative bond?
A dative bond is a covalent bond where the bonding pair of electrons are provided by one atom e.g. in a Hydronium ion oxygen supplies both electrons
What is a Linear shape? (What is the related bond angle?)
A linear shape has 2 electron pairs bonded to the central atom. It has as a bond angle of 180 degrees NOTE: Think of a straight line
What is a Trigonal Planar shape? (What is the related bond angle?)
A trigonal planar shape has 3 electron pairs bonded to the central atom. It has a bond angle of 120 degrees NOTE: Think of a triangle shape
What is a Tetrahedral shape? (What is the related bond angle?)
A tetrahedral shape has 4 eletron pairs bonded to the central atom. It has a bond angle of 109.5 degrees NOTE: Think of a pyramid shape
What is a Trigonal Bipyramidal shape? (What is the related bond angles?)
A trigonal bipyramidal shape has 5 electron pairs bonded to the central atom. It has two bond angles, 90 and 120 degrees NOTE: Its shape is like trigonal planar (3 pairs) + linear (2 pairs)
What is an Octahedral shape? (What is the related bond angle?)
An octahedral shape has 6 electron pairs bonded to the central atom. It has a bond angle of 90 degrees
What is VSEPR theory?
VSEPR theory states that the shape of a molecule is the shape which minimises the repulsion between electron pairs, and maximises seperation NOTE: VSEPR - Valence Shell Electron Pair Repulsion