Which of the following groups of transition metals is known as coinage metals?

The stability of a particular oxidation state of a metal in an aqueous solution can be determined by:

The general electronic configuration of the transition elements is

How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements?

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ Transition elements exhibit variable oxidation states.
$(b)$ The $E^o$ values for $Mn, Zn,$ and $Ni$ are more positive than expected from the general trend.
$(c)$ Any metal exhibits its maximum high oxidation state in oxide and chloride compounds.

In which block does the $106^{th}$ element belong?