Arrange the metals used in this experiment (including H2 and Ag) in order of decreasing reactivity (most reactive metal first). The metals to be included are Ag, Al, Ca, Cu, Fe, H2, Mg, Na, Pb, Sn, and Zn.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.