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The o2− ion has _____ protons and _____ electrons.
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The o2− ion has _____ protons and _____ electrons.

User Radu Murzea
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Because of its electronegativity of -2, the Ion has 8 protons and 10 electrons. It normally has has 8 protons and 8 electrons but since it is an Ion, it has gained a negative charge and, therefore, two more electrons.
User Ritu
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