We are being asked if the species is paramagnetic or diamagnetic so we have to determine theelectron configuration ofCa2+ ion.

You are watching: How many unpaired electrons does calcium have

Recall that paramagnetic species have 1 or more unpaired electrons while diamagneticcontains0 unpaired electron.

To figure that out, let’s first write theelectron 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

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Neutral Calcium (Ca):

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


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Problem Details

Is the following ion diamagnetic or paramagnetic?

Ca2+


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