The ability of transition metal ions to form complex compounds is due to:
- ASmall size
- BVacant $d$-orbitals
- CHigh nuclear charge
- DAll of these
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Number of electrons present in $4f$ orbital of $Ho^{3+}$ ion is $.....$
(Given Atomic No. of $Ho=67$)
(Given Atomic No. of $Ho=67$)
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