What atomic property of cs is most responsible for its high reactivity?

Cesium is a highly reactive substance because of it only has 1 electron in its outermost orbit. So, it makes it easier to pull electrons from an atom of this element. The property that would be responsible would be its electronic configuration. Hope this answers the question.

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o