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

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Solution: Is the following ion diamagnetic or paramagnetic? Ca2+

Problem

Is the following ion diamagnetic or paramagnetic? 

Ca2+

Solution

We are being asked if the species is paramagnetic or diamagnetic so we have to determine the electron configuration of Ca2+ ion

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

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

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

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

Neutral Calcium (Ca):

Atomic number = 20
• # of electrons = 20 e-

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