Cdi2 and cdcl2 which one is more stable?
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CdI2 and CdCl2 are some of the AX2 compounds which are not the sufficiently ionic (slightly covalent) to form the perfectly regular ionic structures.
They form layers (sandwich) structures;
E.g. CdI2. Two sheets of ions are separated by Cd2+ within a sandwich, but between one sandwich and the next, two layers are in contact.
The Cd2+ and I- layers are held by strong electrostatic bonding whilst the adjacent layers of I- are held by weak Van der Waals forces.
Type of packing for CdCl2: ABCABC (cubic-close packed).
Type of packing for CdI2: ABABAB (hexagonal close packed).
For both cases: Cd2+ ion occupies octahedral hole site.
They form layers (sandwich) structures;
E.g. CdI2. Two sheets of ions are separated by Cd2+ within a sandwich, but between one sandwich and the next, two layers are in contact.
The Cd2+ and I- layers are held by strong electrostatic bonding whilst the adjacent layers of I- are held by weak Van der Waals forces.
Type of packing for CdCl2: ABCABC (cubic-close packed).
Type of packing for CdI2: ABABAB (hexagonal close packed).
For both cases: Cd2+ ion occupies octahedral hole site.
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