Why pseudo noble gas configuration has high Polarising power?
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Why pseudo noble gas configuration has high Polarising power?
C. cations with pseudo noble gas configuration have relatively higher polarising power than those with noble gas configuration. Hint: The cation having pseudo noble gas configuration will not have eight electrons in its valence shell like a noble gas but its d orbital will be completely filled.
What is polarization in fajans rule?
The first rule speaks about the polarising power of the cation. If the cation is smaller, then we can say that the volume of the ion is less. If the volume is less, we can conclude that the charge density of the ion would be high. Since the charge density is high, the polarising power of the ion would be high.
What is fajans rule how the size of cation affects the polarization in ionic bond?
The polarizing power of the ion will be high since the charge density is high, this makes the compound to be more covalent. Rule 2: The second rule tells us about the polarizability of the anion….Fajans’ Rule.
| Ionic | Covalent |
|---|---|
| Low positive charge | High positive charge |
| Large cation | Small cation |
| Small anion | Large anion |
What is pseudo noble gas configuration?
Pseudo – inert gas configuration means having 18 electron instead of 8 electrons in (n−1) shell electronic configuration after gaining or loosing electron. This configuration is called as pseudo noble gas configuration .
Which has maximum Polarising power in cation?
Al
The polarising power of a cation increases as the cation’s size decreases, while anions’ polarisability decreases as the cation’s size increases. Hence, Al has the highest polarising power.
Which ions of tin have a pseudo noble gas configuration?
When Sn loses 4 electrons, The electronic configuration of Sn4+ would be and it is stable state. Thus, the element which have fully filled d orbitals (n-1) and the configuration is not same with the noble gas configuration, then it is called a pseudo-noble gas configuration.
What is polarization and polarizing power?
A cation’s ability to distort an anion is described as its polarization power, and its polarizability is defined as the anion’s tendency to become polarized by the cation.
What is Polarising power of a cation?
Complete step by step answer: Polarization power of a cation can be defined as the ability of cation to distort an anion. The tendency of anion to become polarized by the cation is called its polarizability. Polarization power of cation depends on charge and radius.
What is polarizing power of a cation in ionic compounds?
When the degree of polarization is very small, an ionic bond is formed, whereas a covalent bond occurs if the degree of polarization is high. A cation’s ability to distort an anion is described as its polarization power, and its polarizability is defined as the anion’s tendency to become polarized by the cation.
What is the pseudo noble gas electron configuration for Zn atom when it loses 2e?
The Zn2+ ion has lost two electrons, which leaves it with 30 protons and 28 electrons. The electron configuration of Zn2+ is 1s22s22p63s23p63d10 .
Why do cations with pseudo inert gas configuration have more polarising power?
The reason why cations with pseudo inert gas configuration have more polarising power is because of the poor shielding effect of the 3d orbitals which increases the ability of cations to distort the electron cloud of anion, thus more polarising power.
Which is more polarizing noble gas or pseudo noble gas?
This means a comparison needs to be made between a noble gas core and pseudo noble gas core, which as noted above holds that the pseudo noble gas would be the more polarizing. Based on Fajan’s rules, it is expected that every ionic compound will have at least some amount of covalent character.
What is the effect of noble gas configuration on anion distortion?
The cations with psuedo noble gas configuration produce more distortion in the anion due to decrease in the shielding effect (which happens due to the accomodation of 18,18… electrons in a single shell only).Thereby increasing the polarising power and coavalent character.
How does covalent character affect polarising power of cation?
This produces an ionic bond with the help of covalent character. A cation which has inert gas like configuration has less power of polarizing as compared to the cation having pseudo inert gas like configuration. Rule 1: It speaks about the polarising power of the cation.