Theories can be proven.
A theory in physics is formed by a group of hypothesis based on experimentation, it can never be proven. As much as you experience many times and in all agree the results with the theory, you can never be sure that the next time the result will not contradict it. Rather, a theory can be refuted by finding a single observation that disagrees with its predictions.
their crystal patterns have been disrupted by stress
number of electrons for neutral cl
hypotheses can be tested.