King & Queen of Rings

ring its
When each of the following elements forms ions, the one that does NOT have 8 electrons in its outer ring?

When each of the following elements forms ions, the one that does NOT have 8 electrons in its outer ring is?
calcium
chlorine
hydrogen
sodium

hydrogen

*Hydrogen has 1 electron and it gives away 1 electron, so it has 0 electrons left. Calcium has 20 electrons and it gives away 2 electrons, so it has 18 electrons left; that makes 2, 8, 8. Chlorine has 17 electrons and it took 1 electron, so now it has 18 electrons; that makes 2, 8, 8. Sodium has 11 electrons and it gives away 1 electron, so it has 10 electrons left; that makes 2, 8.

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