Which of the following statements is $NOT$ correct for $3d$ and $4f$ series electrons?
- A$3d$ orbital electrons exhibit more oxidation states than the $4f$ series.
- BThe energy difference between $3d$ and $4s$ orbitals is very small.
- CEuropium $(II)$ is more stable than Cerium $(III)$.
- DAs we move from Scandium to Copper,the diamagnetic property in the $3d$ orbital increases.
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