Which among the following elements has a completely filled $4d$ orbital?

Which of the following statements is true for transition elements?

The $CORRECT$ ionisation energy order is

The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

Given below are two statements:
Statement $I$: Ferromagnetism is considered as an extreme form of paramagnetism.
Statement $II$: The number of unpaired electrons in a $Cr^{2+}$ ion $(Z=24)$ is the same as that of a $Nd^{3+}$ ion $(Z=60)$.
In the light of the above statements,choose the correct answer from the options given below:

Which elements do you think would have been named by
$(i)$ Lawrence Berkeley Laboratory
$(ii)$ Seaborg's group?