Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chemical reactivity of two metals? Rubidium (Rb) is more reactive than strontium (Sr) because strontium atoms must lose more electrons. Sodium (Na) is more reactive than magnesium (Mg) because sodium atoms must gain more electrons. Calcium (Ca) is less reactive than potassium (K) because potassium atoms must lose more electrons. Beryllium (Be) is less reactive than lithium (Li) because beryllium atoms must gain more electrons.