The third ionization enthalpy is minimum for

The common oxidation state of scandium $(Sc)$,a transition element,is:

The transition metal which shows oxidation states from $+2$ to $+7$ belongs to group:

In a transition series,as the atomic number increases,paramagnetism

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $Cu^{2+}$ in water is more stable than $Cu^{+}$.
Reason $(R):$ Enthalpy of hydration for $Cu^{2+}$ is much less than that of $Cu^{+}$.
In the light of the above statements,choose the correct answer from the options given below:

Silver atom has completely filled $d$ orbitals $\left(4d^{10}\right)$ in its ground state. How can you say that it is a transition element?