The first transition element is

Which of the following is the correct sequence of atomic weights of the given elements?

The electronic configuration of $Ag$ atom is

Which forms interstitial compounds?

Write the names,symbols,and atomic numbers of the elements named after the scientists $T$. Seaborg,Mendeleev,and Rutherford.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: The first ionization enthalpy of $3d$ series elements is more than that of group $2$ metals.
Reason $(R)$: In $3d$ series of elements,successive filling of $d$-orbitals takes place.
In the light of the above statements,choose the correct answer from the options given below: