please tell if i am correct or wrong the electronic configuration of fe+ should be the same as that of chromium i.e. [Ar] 3d5 4s1 because both have the same number of electrons in the atom

Asked by challenging_genius | 18th Jul, 2010, 12:00: AM

Expert Answer:

Z = 26
Electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d6 4s2
So, when one electron is removed. it will be removed from 4s shell since it is the outermost shell.
Hence the electronic configuration of Fe+ becomes:
Electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d6 4s1
The electronic configuration of Cr with atomic number of 25 is:
Electronic configuration = 1s2 2s2 2p6 3s2 3p6 3d5 4s1
Thus, they are not same.
Always remember that whenever you have to write the electronic configuration of any ion, write the configuration of the atom and then if positively charged start removing electrons from the outermost shell and if negatively charged start adding electrons in the outermost shell.
never remove electrons from the atomic number as the configuration comes out to be wrong sometimes.

Answered by  | 20th Jul, 2010, 12:23: PM

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