Which statements describe how becquerel, the curies, and other scientists contributed to the cumulative understanding of radioactivity? check all that apply. becquerel showed that radioactivity is a form of phosphorescence. the curies established that radioactivity is a property of an atom that does not change if changes occur to the physical or chemical properties of the atom. the curies discovered the element uranium. hans geiger invented a method for detecting and measuring radioactivity. the radium girls demonstrated how to use shielding methods to protect living tissue from harmful radiation produced by radioactive elements