Which transition series includes elements $Co$ and $Mo$ respectively?

Which of the following elements has the maximum first ionisation potential?

The correct electronic configuration of the element $Au$ is

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

Which of the following weighs less when weighed in a magnetic field?

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: