Total number of $d$ electrons present in an element with atomic number $78$ is:

The melting point of $Zn$ is lower compared to those of the other elements of the $3d$ series because $-$

General electronic configuration of outermost and penultimate shell is $(n - 1)s^2 (n - 1)p^6 (n - 1)d^x ns^2$. If $n = 4$ and $x = 5$,then the number of protons in the nucleus will be:

In the following pairs,the one in which both transition metal ions are colourless is

Which of the following statements is correct regarding the ions $Zn^{2+}$,$Ni^{2+}$,and $Cr^{3+}$? (Atomic numbers: $Zn = 30$,$Ni = 28$,$Cr = 24$)

The melting point of $Zn$ is lower as compared to those of the other elements of the $3d$ series because: