List of top Chemistry Questions on d And f - Block Elements asked in UP Board XII

For which of the following ions will the magnetic moment ($\mu$) be maximum?
(A) Write the electronic configuration of the element with atomic number 24.
(B) Find the number of unpaired electrons in $Co^{2+}$ ion.
(C) Why is the range of oxidation states greater in the actinoid series compared to the lanthanoid series?