Identify the weakest base from the following.

Which transition metal configuration exhibits the highest oxidation state?

Discuss the magnetic properties of transition elements.

Discuss the position of $d$-block elements in the periodic table.

Identify the incorrect statement in the following.

Write down the electronic configuration of:
$(i) Cr^{3+}$
$(ii) Pm^{3+}$
$(iii) Cu^{+}$
$(iv) Ce^{4+}$
$(v) Co^{2+}$
$(vi) Lu^{2+}$
$(vii) Mn^{2+}$
$(viii) Th^{4+}$