QJEEM02Chc935: JEE Main 2002 Chemistry - Class 11 JEEM02Chc935 Solution: C e + 3 , L a + 3 , P m + 3 and Y b + 3 have ionic radial in…

Here $$C{e}^{+3},P{m}^{+3},Y{b}^{+3}$$ are from lanthanide series.

$$L{a}^{+3}$$ atomic number is $$57.$$ This is a $$d$$ block element but all the property of $$La$$ is similar to lanthanides. It is present before $$Ce.$$

As we know in lanthanides the radius of elements decreases from left to right of periodic table.

So, order will be $$L{a}^{+3}>C{e}^{+3}>P{m}^{+3}>Y{b}^{+3}$$