What is the general electronic configuration for the $2^{nd}$ row transition series?

In which of the following pairs,both the elements do not have $(n-1)d^{10} ns^2$ configuration?

What is the atomic number of an element having $ns^1$ electronic configuration and belonging to the $3d$ transition series?

Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them?

Correct statement for $3d-$ series is

The electronic configurations of four elements are:
$(i) \; [Xe] \; 6s^1$
$(ii) \; [Xe] \; 4f^{14}5d^16s^2$
$(iii) \; [Ne] \; 3s^23p^5$
$(iv) \; [Ar] \; 3d^74s^2$
Which one of the following statements about these elements is not true?