Multiple choice Which of the following metals is the most reactive? Calcium Iron Aluminium Copper Lead Reveal answer Fill a bubble to check yourself A Correct answer Explanation Calcium is the most reactive according to the reactivity series (activity series) of metals. Decreasing chemical reactivity is: K > Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > H > Cu > Hg > Ag > Au