Why Cr shows 3d54s1configuration instead of 3d44s2?
Correct answer: C. Because of extra stability of half-filled d5 system
- A. Because it is transition element
- B. Because it shows different oxidation states
- C. Because of extra stability of half-filled d5 system
- D. Because it is typical transition element
Explanation
In a half-filled d5 system, the electrons are delocalized over the five d orbitals. This means that the electrons are not localized in one particular orbital, but they are spread out over all five orbitals. This delocalization of electrons makes the half-filled d5 system more stable because it makes the electrons less likely to interact with the nucleus.
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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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