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Which statement is incorrect with refere...

Which statement is incorrect with reference to inner transition elements?

A

The oxides of lanthanoids are basic

B

Pm is radioactive element among actinoids

C

The values of ionization enthalpy of actinoids are less than the values of ionization enthalpy of lanthanoids

D

Only in the electronic configuration of lanthanoids like Ce, Gd, Lu the electron are filled in 5d orbitals

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The correct Answer is:
B
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