Why is polarization capacity maximum in pseudo inert gas configuration?
It refers to elements having 18 electrons instead of just 8 in their outermost electron configuration when they lose or gain electrons.
For example, Ag has 47 electrons when it's neutral: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10
When it loses its 5s1 electron, it has an electron configuration of: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10
Notice that the highest energy level is 4s2 4p6 4d10 which has 18 electrons. Instead of saying it has a noble gas electron configuration like the s2 p6 octet it has s2 p6 d10 which is a "pseudo-noble gas electron configuration.
Therefore any element that has an outermost electron configuration of s2 p6 d10 instead of s2 p6 is known to have a pseudo-noble gas electron configuration.
This is due to the fact that the elements having a pseudo noble gas configuration have a majority of their outermost electrons filled in a ’d subshell’.
Now the d subshell has a weak screening power and so it doesn't shield the electrons lying outside itself (electrons of the other atom participating in the ionic bond) from the attraction of the nucleus.
Thus, polarizing the other atom to a greater extentPolarising power of a cation increases when its nucleus has strong attractive power towards the nearby anion.
And for pseudo noble gas configuration ,acc to slaters rule ,Z eff increses highly for which it gains high polarising power.
It refers to elements having 18 electrons instead of just 8 in their outermost electron configuration when they lose or gain electrons.
For example, Ag has 47 electrons when it's neutral: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d10
When it loses its 5s1 electron, it has an electron configuration of: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 4d10
Notice that the highest energy level is 4s2 4p6 4d10 which has 18 electrons. Instead of saying it has a noble gas electron configuration like the s2 p6 octet it has s2 p6 d10 which is a "pseudo-noble gas electron configuration.
Therefore any element that has an outermost electron configuration of s2 p6 d10 instead of s2 p6 is known to have a pseudo-noble gas electron configuration.
This is due to the fact that the elements having a pseudo noble gas configuration have a majority of their outermost electrons filled in a ’d subshell’.
Now the d subshell has a weak screening power and so it doesn't shield the electrons lying outside itself (electrons of the other atom participating in the ionic bond) from the attraction of the nucleus.
Thus, polarizing the other atom to a greater extentPolarising power of a cation increases when its nucleus has strong attractive power towards the nearby anion.
And for pseudo noble gas configuration ,acc to slaters rule ,Z eff increses highly for which it gains high polarising power.
