Question

electron configuration for Cr2+

Answer 1

Answer:

Electronic configuration of $Cr^{2+}$ is $1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 3d^{4}$

Explanation:

We know that the atomic number(Z) of chromium is 24

therefore, for $Cr^{2+}$ the total number of electrons present in the atom = 22

Chromium has a special case to the electronic configuration

Electronic configuration of elemental chromium = $1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 4s^{1} 3d^{5}$

This is because electron repulsion is minimized in this arrangement. For Cr in particular, half-filled orbitals are the most stable structure.

so, when we remove 2 electrons from chromium one electron from 4s, and one electron from 3d will leave.

therefore the electronic configuration of $Cr^{2+}$ is $1s^{2} 2s^{2} 2p^{6}3s^{2} 3p^{6} 3d^{4}$