Chemistry Practice Problems Paramagnetic and Diamagnetic Practice Problems Solution: Is the following ion diamagnetic or paramagnetic? ...

Solution: Is the following ion diamagnetic or paramagnetic?  Cr

Problem

Is the following ion diamagnetic or paramagnetic? 

 Cr

Solution

We are being asked if the species is paramagnetic or diamagnetic so we have to determine the electron configuration of Cr 

Recall that paramagnetic species have 1 or more unpaired electrons while diamagnetic contains 0 unpaired electrons.

To figure that out, let’s first write the electron configuration of a neutral (uncharged) Cr atom.

Ground-state means that Chromium is in its lowest energy form (not in an excited state). 

Neutral element:       Atomic number = # protons = # of electrons


Neutral Chromium (Cr):

Atomic number = 24
• # of electrons = 24 e-

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