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-
Is the following ion diamagnetic or paramagnetic?
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