When are $d$-block elements considered as transition elements?
- AIn the ground state,the $d$-orbital is completely filled with electrons.
- BIn the ground state or any stable oxidation state,the $d$-orbital is incompletely filled with electrons.
- CIn all oxidation states,the $d$-orbital is completely filled with electrons.
- DIn only one oxidation state,the $d$-orbital is completely filled with electrons.
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