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Polarisation
The distortion of the electron cloud in a molecule or ion by a nearby change.
Delocalised electrons
Bonding electrons that are not fixed between two atoms in a bond. They are free to move and shared by several or many more atoms.
Metallic bonding
Strong attraction between a lattice of positive metal ions and a 'sea' of delocalised electrons.
Things affecting polarising power
1. Size of cation radius
2. Charge of cation
3. Size of anion radius
Dative covalent bond
A bond where 2 atoms share a pair of electrons, both the electrons being donated by one atom.
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