What is fajans rule and please explain the term 'polarizing effect' in detail...??
Asked by Keshav sultania | 15th Sep, 2013, 05:48: PM
Fajan gives the following four rules for the Polarisation:
Polarization will be increased by:
1. High charge and small size of the cation.
2. High charge and large size of the anion.
3. The polarizability of an anion is related to the deformability of its electron cloud (i.e. its softness)
4. An incomplete valence shell electron configuration. Noble gas configuration of the cation produces better shielding and less polarizing power.
For example, sodium chloride has a low positive charge (+1) on the cation. The cation is fairly large (~1 Å) and the anion is relatively small (2 Å). Sodium chloride is ionic.
Aluminium iodide, on the other hand, has a high positive charge (+3) on the cation and a large anion, and is covalent.
Fajan gives the following four rules for the Polarisation:
Polarization will be increased by:
1. High charge and small size of the cation.
2. High charge and large size of the anion.
3. The polarizability of an anion is related to the deformability of its electron cloud (i.e. its softness)
4. An incomplete valence shell electron configuration. Noble gas configuration of the cation produces better shielding and less polarizing power.
For example, sodium chloride has a low positive charge (+1) on the cation. The cation is fairly large (~1 Å) and the anion is relatively small (2 Å). Sodium chloride is ionic.
Aluminium iodide, on the other hand, has a high positive charge (+3) on the cation and a large anion, and is covalent.
Answered by | 17th Sep, 2013, 09:01: AM
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Sign Up
Verify mobile number
Enter the OTP sent to your number
Change