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Question

What is the electronic configuration of Chromium in [Cr(NH3)6]3+?


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Solution

Electronic configuration:

  • It is defined as the distribution of electrons of an atom in an atomic orbital.
  • The general notation of electronic configuration is sapbdc where s,p, and d represents the subshell and a,b and c represents the number of electrons present in the subshell as superscript.

Atomic number:

  • The symbol of Chromium is Cr.
  • Atomic number of Chromium is 24 which is a transition element and it belongs to 4th period and 6th group of periodic table.
  • As the atomic number is equal to the number of electrons present in a neutral element. So, the number of electrons are 24.
  • The electronic configuration of Chromium should be 1s22s22p63s23p64s23d4.
  • But as we know that the half-filled and fully filled electronic configuration are more stable. So, one electron is transferred from 4s orbital to 3d orbital.
  • Thus, the electronic configuration of Chromium is 1s22s22p63s23p64s13d5.
  • The electronic configuration of Chromium in noble gas notation is represented as [Ar]3d54s1 where [Ar] represents the inert core of Argon which is a noble gas and 3d54s1 represents the valence shell electronic configuration of Chromium.

Hence, the electronic configuration of Chromium is 1s22s22p63s23p64s13d5 or [Ar]3d54s1.


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