1.

Which statements is incorrect with reference to inner transition elements?

Answer»

Pm is radioactive element among actinoids
Only in the electronic configuration of lanthanoids lke CE, GD and Lu the electrons are filled in 5d orbitals
The values of ionisation ENTHALPY of actinoids are less than the values of ionisation enthalpy of lanthanoids
The oxides of lanthanoids are basic

Solution :Pm does not BELONGS to actinoids series


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