Li, KCl

[budullewraagh]

we were speaking of activity, not reactivity. the two are totally different terms. activity based on reduction potentials. a more active metal will replace a less active metal.

ex:

Li+KNO3->LiNO3+K

also, other reactions occur based on activity. examples:

H2SO4+KMnO4->HMnO4+K2SO4

KI+Cl2->KCl+I2

[budullewraagh]

reactivity is based on reaction rates. yes, cesium reacts with air and water much faster than lithium. reactivity, however, is not what we are speaking of. rather, we are speaking of activity.