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Group 2 elements, the Alkaline earth metals, become a +2 ion, and combine to make (OH)2 metal hydroxides. Any element in the first column (Group 1) of the periodic table will react violently with water. They get more explosive as you go down the column, so that means lithium, sodium, potassium, rubidium, caesium and francium will be more reactive, in that order. The elements in the second column (Group2) react less violently with water. And like the Group 1 elements, their reactivity increases as we go down the column. <br /><br />When added to water the Group 1 elements, the Alkali metals, becomes a +1 ion, and the water forms OH- (creating the metal hydroxide) and H2 gas.
Reaction of metals and water (General) A few very reactive metals will react with cold water. Potassium's reaction is the most violent that you are likely to encounter in the science lab. Potassium, sodium, lithium and calcium all react very fast when placed in water. The products of the reaction in each case are a metal hydroxide (froming an alkaline solution) and hydrogen gas. The chemical equation for potassium reacting with water is: 2K + 2H2O â 2KOH + H2. (potassium + water â potassium hydroxide (an alkali) + hydrogen) Magnesium requires the water to be in the form of steam for a clearly observable reaction to take place.