Question

The electronic configuration of $E{u^{ + 3}}$ ion is:

Answer 1

The electronic configuration gives information about the arrangement of electrons in energy levels around the atomic nucleus. The electronic configurations describe each electron as moving independently in an atomic orbital, in an average field created by all other atomic orbitals.

Complete answer:
There is a standard notation to indicate the electronic configurations of atoms and molecules. For atoms, the notation consists of a sequence of atomic subshells with a specific number of electrons assigned to each subshell placed as a superscript. For the atoms having many electrons, this notation will become lengthy. So, an abbreviated notation is used. The electronic configuration can be visualized as the core electrons, which are equivalent to the noble gas of the preceding period and the valence electron. The electronic configuration of $E{u^{ + 3}}$ ion is $[{\text{Xe}}]4{{\text{f}}^6}$ . The element Europium is a soft white silvery metal. It is not a naturally occurring element. This element is a neutron adsorber. So, it is used in nuclear reactor control rods. Europium phosphors are also used in television tubes to give a bright red color. The order of writing the orbitals is not completely fixed because only the orbital occupancies have physical significance.
Therefore, the electronic configuration of the $E{u^{ + 3}}$ ion is $[{\text{Xe}}]4{{\text{f}}^6}$

Note:
The knowledge of the electronic configuration of different atoms helps in understanding the structure of the periodic table of elements. Note that the electronic configuration is also useful to describe the chemical bonds which hold the atoms together.