Which statement is incorrect with reference to inner transition elements?
- AThe oxides of lanthanoids are basic.
- B$Pm$ is a radioactive element among actinoids.
- CThe values of ionisation enthalpy of actinoids are less than the values of ionisation enthalpy of lanthanoids.
- DOnly in the electronic configuration of lanthanoids like $Ce, Gd, Lu$ the electrons are filled in $5d$ orbitals.
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