Identify the element for which the electronic configuration in the $+3$ oxidation state is $[Ar] 3d^5$:

What are the characteristics of the transition elements and why are they called transition elements? Which of the $d$-block elements may not be regarded as the transition elements?

Determine the name and symbol of the element with atomic number $103$.

What are the atomic radii of $Au$ and $Cu$ in $22$ carat gold jewelry?

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

Among $V, Cr, Zn, Fe$,the metal having the lowest enthalpy of atomization is