Reactivity Series: Comparing the Reactivity of Group 1 and Group 2 Metals

We compare the reactivity of Group 1 and Group 2 metals. We add sodium and then potassium to water. We observe the reactions. Next we add magnesium and then calcium to hydrochloric acid and observe the reactions. The results let us put the metals in order of reactivity \u2013 potassium, sodium, calcium and then magnesium. Chemistry - Periodic Table - Learning Points. Group 1 metals are more reactive than Group 2 metals, because their atoms have fewer delocalised electrons holding the metallic structure together. The reactivity of a metal increases as you go down the periodic table; this is because the electrons in these metals are further from the nuclei, making the bonds in the metal weaker. Metal + water ➔ metal hydroxide + hydrogenMetal + acid ➔ salt + hydrogen Hydrogen gas makes a popping sound when it burns. A Twig Experiment Film. Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.