[theascended]

Good morning everyone,

The Chemistry teacher gave our class a question on a test that we'd honestly never touched on before. It was something like this: "Which of the metals reacts with H₂O (gas)?", and the alternatives were: Sodium, Magnesium and Fluorine(despite it not being a metal).
Could you guys please, if you could, tell me what the right answer is, and also explain it a bit? It might be really easy and we've actually done something like this before, but I can't quite understand it.

Thank you in advance.

[Borek]

What do you know about reaction of these elements with liquid water?