Ionic Bonding

Question 1

Definition of ionic bonding

Answer 1

efa between oppositely charged ions in a giant ionic lattice

Question 2

Magnitude of LE

Answer 2

LE ∝ charge/radius

Question 3

4 properties of ionic compounds

Answer 3

1. High MP and BP
   - a large ant of energy is req’ed to overcome the strong efa bt oppositely charged ions in a giant ionic lattice
2. Non-electrical conductor in solid, conductor in molten and aq
   - ions fixed
   - broken down to form mobile ions
3. Hard but brittle
   -ions arranged in orderly lattice of layered ions, displace one layer of ions relative to another
   -> ions of similar charge to come tgt
   => repulsion fall apart
4. Soluble in water and polar solvents; insoluble in non-polar
   - ion-dipole interacts release sufficient energy to overcome the large amt of energy to dissociate the interactions bt ionic lattice

Question 4

Two exceptions of metal + non-metal that give covalent compound?

Answer 4

AlCl3

NH4Cl

Question 5

Why us Na2O fully ionic?

Answer 5

It has either a high charge density nor a large polarisable electron cloud
-> orbitals would not overlap
=> ionic