Which elements are more/less reactive than which

K is ______ reactive than Ca.
Sr is ______ reactive than Rb.
Br is ______ reactive than I.
Cs is ______ reactive than Ba.
Ba is ______ reactive than Mg.

thanks in advance. :)

K is MORE reactive than Ca.
Sr is LESS reactive than Rb.
Br is MORE reactive than I.
Cs is MORE reactive than Ba.
Ba is MORE reactive than Mg.

If you are given a periodic table then everything below is more reactive, if in the same column. Also moving outwards is more reactive along a row, except for the last column on the RHS, which is called the inert gasses cos they don't react very much at all.

K more Ca
Sr less Rb
Br more I
Cs more Ba
Ba more Mg