Permanent magnets are made from:

How many of the following lanthanide elements exhibit $+4$ oxidation state?
$Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy$

Which one of the following ions has the same number of unpaired electrons as those present in $V^{3+}$ ion?

Which of the elements possess only one electron in the $5d$-orbital?

In the ground state of cobalt atom $(Z = 27)$ there are $.......$ unpaired electrons and thus the atom is $.......$

Elements up to atomic number $103$ have been synthesized and studied. If a newly discovered element is found to have an atomic number $106,$ its electronic configuration will be