Question
Tue February 15, 2011 By: Srishti Aggarwal
 

Give reason- Size of trivalent decreases with the increase in atomic number?

Expert Reply
Thu February 17, 2011
Dear Student
 
The radii of the trivalent ions decrease slightly as the atomic number increases. The reason is that whereas nuclear +ve charge goes on increasing as the atomic number increases, the  electronic cloud experiences more inside pull (as the charge on the nucleus increases), all electrons are pulled in closer to the nucleus due to the occurrence of incompletely filled anti-penultimate shell so that the radii of the trivalent-ions decrease slightly as the atomic number increases.
 
We hope that clarifies your query.
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