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Because of its position on the Periodic Table (determined by the number of protons in the nucleus) it has 6 valence electrons. A stable Octet would give it an Argon structure. So it wants to gain 2 electrons rather than lose 6 as gaining 2 is more energetically favorable. So if it gained 2 it would have a -2 charge - hence the valency is often stated as -2.

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