Why does Cr show 3d54s1 configuration 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
The correct answer is: Because of the extra stability of the half-filled d5 system. The electron configuration of chromium (Cr) is often represented as 3d5, 4s1 instead of 3d4, 4s2. This is because the configuration of 3d5, 4s1 provides a half-filled d-orbital, which offers extra stability compared to the 3d4, 4s2 configuration.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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