1.

Which one of the following is the correct increasing order of the magnitude of ionic radii of Ce^(3+), La^(3+) , Pm^(3+) and Yb^(3+) ?

Answer»

`Yb^(3+)lt PM^(3+) lt La^(3+) lt CE^(3+)`
`Yb^(3+) ltPm^(3+) lt Ce^(3+) lt La^(3+)`
`Pm^(3+) ltLa^(3+) ltCe^(3+) lt Yb^(3+)`
`Ce^(3+) lt Yb^(3+) lt Pm^(3+) lt La^(3+)`

SOLUTION :`{:(La^(3+),gt,Ce^(3+),gt,Pm^(3+),gt,Yb^(3+)),(106p m,,103p m,,98pm,,87 p m):}`
Ionic size DECREASE form`La^(3+)` to `Lu^(3+)` due to lanthanide contraction . Thus,
`Yb^(3+) lt Pm^(3+) lt Ce^(3+) lt La^(3+)`


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