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CBSE - XII Science - Chemistry - The d-Block and f-Block Elements

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

Asked by sheetu.k.aggarwal 15th February 2011, 9:23 PM
Answered by Expert


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.
Answered by Expert 17th February 2011, 8:50 PM

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