Why dont we use words like prove or does not prove in science

Using the periodic table, complete the table to describe each atom. type in your answers

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)

Which element is the least metallic between cadmium, silver, zinc, or iron?