What are the conditions that are favorable for extensive sol

What are the conditions that are favorable for extensive solid solubility of one element in another?

Solution

The following conditions are favorable for extensive solid solubility of one element in another:

1.) The diameters of the atoms of the elements must not differ by more than about 15%.

2.) The crystal structures of the two elements must be the same.

3.)    No appreciable difference in the electronegativites of the two elements.

4.) Two elements should have the same valence.