The element having the electronic configuration $[Kr] 4d^{10} 4f^{14} 5s^2 5p^6 5d^2 6s^2$ belongs to:

What is the highest possible oxidation state exhibited by manganese $(Mn)$?

The magnetic moment of $M^{x+}$ (atomic number $= 25$) is $\sqrt{15} \ BM$. The number of unpaired electrons and the value of $x$,respectively,are

Among the following components of cement,which is present in the highest amount?

$A$ copper salt is isomorphic with $ZnSO_4$. The salt will be:

Which of the following metals exhibits more than one oxidation state?