The electronic configuration of $Cr^{3+}$ is

The period number and group number of Tantalum $(Z = 73)$ are respectively:

Out of $Cu_2Cl_2$ and $CuCl_2$,which is more stable and why?

The correct order of atomic/ionic radii is

Which of the following is not a transition metal?

How many of the following metal ions have similar values of spin-only magnetic moment in the gaseous state?
(Given: Atomic number: $V, 23; Cr, 24; Fe, 26; Ni, 28$)
$V^{3+}, Cr^{3+}, Fe^{2+}, Ni^{3+}$