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Which is the correct order of radius ?Sc > Ti > V < CrCe > Pr > Nd > PmLi > Na > K > RbTi+2 < V+2 < Cu+2

Question

Which is the correct order of radius ?

Sc > Ti > V < Cr

Ce > Pr > Nd > Pm

Li > Na > K > Rb

Ti+2 < V+2 < Cu+2

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Solution

The order of atomic radii generally decreases across a period (from left to right) on the periodic table and increases down a group (top to bottom). This is due to the increase in positive charge in the nucleus and the increase in the number of energy levels or shells.

  1. Sc > Ti > V < Cr: This order is incorrect. The correct order should be Sc > Ti > V > Cr. As we move from left to right across a period, the atomic radius decreases.

  2. Ce > Pr > Nd > Pm: This order is correct. As we move down the lanthanide series (from Ce to Pm), the atomic radius decreases due to the lanthanide contraction.

  3. Li > Na > K > Rb: This order is incorrect. The correct order should be Li < Na < K < Rb. As we move down a group in the periodic table, the atomic radius increases.

  4. Ti+2 < V+2 < Cu+2: This order is incorrect. The correct order should be Ti+2 > V+2 > Cu+2. As we move from left to right across a period, the ionic radius decreases. This is because the number of protons increases, which pulls the electrons closer to the nucleus, decreasing the size of the ion.

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