The higher oxidation states of transition elements are found to be in combination with $A$ and $B,$ which are

The set of elements which obey the general electronic configuration $(n-1)d^{1-10}ns^2$ is

$A$ first row transition metal in its $+2$ oxidation state has a spin-only magnetic moment value of $3.86 \ BM$. The atomic number of the metal is

Identify the element having the highest enthalpy of atomization from the following.

$La$ (lanthanum) having atomic number $57$ is a member of

The electronic configuration $4d^3$ $5s^2$ belongs to which group in the periodic table?