The correct electronic configuration of ʻCr' is
Correct answer: D. [Ar] 3d54s1
- A. [Ar] 3d44s1
- B. [Ar] 3d44s2
- C. [Ar] 3d54s2
- D. [Ar] 3d54s1
Explanation
In 3d series (1st series of transition elements), two elements "Cr" and "Cu" have differe electronic configuration. 24Cr [Ar] 3d5 4s124Cu [Ar] 3d10 4s1
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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