Understanding Fajans Rule: Ion Depletion & Valency Change

[loza17]

fajans rule??

hey can anyone help me with fajans rule?

after the emission of alpha rays from a radioactive substance the product remaining has a valency of 2. after the emission of beta rays it has a valency increase of 1. so the ionic depletion changes the valency.

thus meaning reducing the ions changes the valency

is this right?

 

[Gokul43201]

What does this have to do with Fajan's rules?

In any case, the important thing to keep in mind is that it is harder to change the nuclear composition (number of protons and neutrons) than the electronic composition. Once the number of protons is changed, the resulting ion will attract or throw away the necessary number of electrons to stay neutral. So, if the atom gains/loses n protons through radioactive decay, it will then pick up/throw out n electrons as well.

With this in mind, make sure you can follow what is happening with the atom above. What would have been the valency before alpha emission? Do the subsequent changes in valency make sense?

 

[loza17]

thats what my tutor taught me and i was confused about it. thanks for the help =]