Which is the correct electronic configuration of Chromium (24Cr)?
Correct answer: D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
- A. 1s2, 2s2, 3s2, 2p6, 3p6, 4s2, 3d6
- B. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4
- C. 1s1, 2s2, 2p6, 3s2, 3p6, 3d6
- D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
Explanation
The atomic number of chromium = 24. Cr (Z = 24) = 1s2, 2s2 2p6 3s2 3p6 4s1 3d5
This question appeared on the UHS MDCAT 2018 paper, which you can sit online with every answer explained.
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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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