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Question

What is the electron configuration of chromium?


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Solution

Chromium:

  • Chromium is a d-block element having atomic number 24.
  • The chemical symbol of Chromium is ‘Cr

Electronic configuration of d-block

  • In general, the outer electronic configuration of these elements is (n-1)d1-10ns1-2.
  • Here, (n–1) stands for the inner d orbitals which may have one to ten electrons, and the outermost ns orbital may have one or two electrons.

Electronic configuration of Cr

  • Cr is an exception where the last electron enters into the 3d orbital instead of 4s orbital to attain half-filled stability.
  • The electronic configuration of chromium is 1s22s22p63s23p64s13d5.

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