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Last updated date: 24th Nov 2023
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MVSAT Dec 2023

An element has electronic configuration \[\left[ {Xe} \right]4{f^7}5{d^1}6{s^2}\]. It belongs to --block of the periodic table.
1) $S$
2) $P$
3) $D$
4) $F$

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Hint: We know that the electronic configuration of a component portrays how electrons are appropriated in its nuclear orbitals. Electron setups of molecules observe a standard documentation wherein all electron-containing nuclear subshells are set in an arrangement.

Complete answer:
Since \[n = 6\] , the component is available in the sixth period. It is an f – block component as the last electron possesses the f–orbital. It has a place with group three of the table since all f-block components have a place with group three. Its electronic arrangement is \[\left[ {Xe} \right]4{f^7}5{d^1}6{s^2}\]. Subsequently, its nuclear number is \[54 + 7 + 2 + 1 = 64\]. Subsequently, the component is Gadolinium. Therefore, the option D is correct.

Additional information:
We must have to know that the gadolinium is a compound component with nuclear number \[64\] . Gadolinium is a shimmering white metal when oxidation is eliminated. It is just marginally pliable and is a pliable uncommon earth component. Gadolinium responds with barometrical oxygen or dampness gradually to shape a dark covering. Gadolinium is a ferromagnetic compound with Curie point of \[20^\circ C\] with a fascination in an attractive field higher than that of nickel and it is the most paramagnetic component. It occurs in the earth as an oxidized structure. When isolated, it normally has contaminations of the other uncommon earths on account of their comparative substance properties.

Now we can discuss about the electron Configurations are valuable for:
Deciding the valency of a component.
Foreseeing the properties of a gathering of (components with comparative electron setups will in general display comparative properties).
Deciphering nuclear spectra.
This documentation for the dissemination of electrons in the nuclear orbitals of iotas came into training soon after the Bohr model of the molecule was introduced by Ernest Rutherford and Niels Bohr in the year \[1913\].