Question

The element having electronic configuration $\left[ {Kr} \right]4{d^{10}}4{f^{14}}5{s^2}5{p^6}5{d^1}6{s^2}$ belongs to :
(A) S-block
(B) P-block
(C) D-block
(D) F-block

Answer 1

Hint : Firstly we should be clear what exactly is the electronic configuration. Now it is basically the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. Now using the principles we get that the correct answer as per the principles. It can be easily determined by the last filling electron according to the Aufbau principle.

Complete Step By Step Answer:
We know that in the field of atomic physics and quantum chemistry, the electron configuration is considered as the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
Now we can say that the Electronic configurations are the ones that describe each electron is moving independently in an orbital, and also in an average field created by all other orbitals. Mathematically, we can say that the configurations are described by Slater determinants or configuration state functions.
Since in the given electronic configuration the all subshell are fully filled except the 5d subshell.
We know by the basic rules of the electronic configuration like the aufbau principle, that the electronic configuration of the element with the last 5d subshell in which the electrons are filled in the electronic configuration of element states that the element belongs to D block.
Therefore the correct option would be option C.

Note :
According to the laws of quantum mechanics, for systems with only one electron, a level of energy is associated with each electron configuration and in certain conditions, electrons are able to move from one configuration to another by the emission or absorption of a quantum of energy, in the form of a photon.