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In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})?

AThe ion has a more stable electronic arrangement than the atom.
BThe positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
CThe ion has two more protons than the atom.
DThe ion will react more readily with free Cl₂. (E)The ion has two more planetary electrons than the atom. Can anyone explain this one?

Verified Answer :

The correct answer is A.  Atoms and ions only differ in the number of electrons each one has and atoms form ions to achieve a more stable electron configuration.  

I hope this helps.  Let me know if anything is unclear.

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