the electronic of an element is [Ar] 3d7,4s2 to which block and period does it belong?
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An element having electronic configuration [Ar]3d2, 4s2 belongs to (A) d-block. (B) f-block (D) p-block .(C) s-block
Mathematics


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Harsha Dhaliwal
Grade 11

Here n=4 it lies in d-block
The symbol [Ar] in the condensed electron configuration of this element resembles the electron configuration of a ground-state argon Ar atom. It represents all inner shell electrons of this atom. (see this problem for details about condensed electron configurations.)
On the top of that, a ground-state atom of this element would contain valence electrons 3d74s2. It would lie in the period right underneath the one containing argon. Argon is the last element of the third period. As a result, this element is in the fourth period of the periodic table. (And hence n=4)
The block on the periodic table an element belongs to is dependent on the type of the occupied electron orbital of highest potential energy.
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