1) Na+
2)Ca 2+ (subscript #s)
3)H-
4)O 2- (subscript #s)
2 Answers
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“It is the Hydride ion (or H-) because when you have a negative ion it means that you add electrons. Therefore Hydride has one electron and helium has two, so when you add one to H-, you get two.”
So:
3)H- {ANSWER}
The above summary in quotes is not my own, and I do not claim it as mine.
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none do
