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IONIC SOLIDS
•Ionic solid: no discrete molecular units rather a 3-D lattice of cations(+), anions(-) in a fixed arrangement. eg. Na Cl
•Strong electrostatic attraction between each ion and neighbouring oppositely charged ions     
holds the solid together.
This attraction is
termed ionic bonding.            
•Ionic bonding is common
between elements on the LHS & RHS of the periodic table, ie. metal + non-metal
Cl-
Na+