Find the Electron Configuration Eu

The electron configuration is the arrangement of electrons of an atom. It concerns the way electrons are distributed in the orbitals of the atom. There are ${\displaystyle 4}$ orbital types (${\displaystyle s}$,${\displaystyle p}$,${\displaystyle d}$,${\displaystyle f}$) and up to ${\displaystyle 7}$ different energy levels where an electron may reside.