why an oxide ion has -2 charge
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an oxide ion has -2 as charge because oxygen atom gains two electrons to complete it's octet and become stable.
Since, it gains 2 electrons it has a negative charge
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oxygen contains 6 electron in its last shell so it needs only 2 electron to complete its octet .
Oxygen takes 2 electron from another atom and form oxide hence it has -2 charge
Oxygen takes 2 electron from another atom and form oxide hence it has -2 charge
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