Among sodium Na, Magnesium Mg,Copper Cu,Chlornie which is most reactive metal and why ?

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Explanation: 

Among the choices given above the most reactive element is Chlorine but you need to pay attention as in the question it is mentioned that we need to tell the most reactive metal and Chlorine is'nt a metal .

So, this eliminates the Chlorine from the rest of the given elements and then we have Na,Mg,Cu as the alkai metals are the most reactive metals our choice should be sodium Na an allkali metal .

Answer: 

Sodium as it is an alkali metal and alkali metals are most reactive