In what respect does an atom of magnesium, Mg, differ from a magnesium ion, Mg2+?
(A) The ion has two or more planetary electrons than the atom.
(B) The ion has two more protons than the atom.
(C) The ion has an inert gas electron configuration; the atom does not.
(D) The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
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