Which ion has the same electron configuration as an atom of He? Na, Ca, H, or O?

NetherCraft 0

1) Na+

2)Ca 2+ (subscript #s)


4)O 2- (subscript #s)

2 Answers

  • “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.”


    3)H- {ANSWER}

    The above summary in quotes is not my own, and I do not claim it as mine.

  • none do

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