Which of the following is a reactive gas?

1. Cl
2. Na
3. Au
4. Ra
5. Rn

Is it 1. Cl?

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  1. I don't know that Cl is a gas. Cl2 is a gas, and it is quite reactive.

  2. I chose Cl since the only other possibility is Rn, which, as a noble gas, isn't very reactive. Would Rn be correct, instead?

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  3. No, Radon is quite resistant to reaction.
    Cl is the best answer, however, Cl2 is chlorine gas. Discuss this with your teacher.

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