I only know it's oxygen, but I don't know the negative sign?

Science
Tutor: None Selected Time limit: 1 Day

Oct 24th, 2015

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  is the oxide ion.

2- means that the element has receive 2 extra electrons.
So the number of electrons for Oxygen atom is 8. 
But the number of electrons for Oxide ion in 10 because 8 + 2 is 10.  

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Oct 24th, 2015

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