Which element woud be the most reactive among Ca , Al and Si and why ?

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Explanation: 

Ca and Al are non metals while Si is a metalloid.

The general periodic trend for metals is that reactivity increases going down and to the left. Aluminium is left  of Ca calcium so it should be less reactive then Ca and Si being a metalloid would be lesser reactive then both of them

So, the most reactive one would be Ca among them.

Answer: 

Ca calcium would be most reactive