The atomic number of an element is $22$. The highest oxidation state exhibited by it in its compounds is

From $+6$ to $+1$ oxidation state is shown by the element of ....... group.

Which of the following elements are included in the fourth transition series?

Which of the following transition metals has the lowest density?

Gadolinium has a low value of third ionisation enthalpy because of $......$

Why are the $E^o$ values for $Mn^{2+}/Mn$,$Zn^{2+}/Zn$,and $Ni^{2+}/Ni$ more negative than expected? The table below provides the values:
| $E^o_{Mn^{2+}/Mn}$ | $E^o_{Zn^{2+}/Zn}$ | $E^o_{Ni^{2+}/Ni}$ |
| :--- | :--- | :--- |
| $-1.18 \ V$ | $-0.76 \ V$ | $-0.25 \ V$ |