Arrange the Ce+3,La+3,Pm+3andYb+3 in increasing order of their ionic radii:
A
Ce+3<Yb+3<Pm+3<La+3
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B
Pm+3<La+3<Ce+3<Yb+3
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C
Yb+3<Pm+3<La+3<Ce+3
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D
Yb+3<Pm+3<Ce+3<La+3
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Solution
The correct option is DYb+3<Pm+3<Ce+3<La+3 In Lanthanides there is a regular decrease in atomic radii as well as ionic radii in trivalent ions the atomic number increases from Ce to Lu. This decrease in size of atoms and ions called lanthanide contraction. Although the atomic radii shows some irregularities but ionic radii decreases from La to Lu. Thus the correct order is, Yb+3<Pm+3<Ce+3<La+386.8pm97pm102pm103pm