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Reactivity trend in alkaline earth1/18/2024 ![]() This is because metal hydroxides thermally decompose to give the metal oxide and water. When metal reacts with cold water, we get metal hydroxide and when metal reacts with steam, the metal oxide is formed. So, it reacts vigorously with water at room temperature. It requires the least ionisation energy and hence activation energy to form ions. Barium (Ba) is the second last alkaline earth metal and is the heaviest metal in its group. Consequently, this leads to lower activation energy and therefore, faster reactions. Barium forms barium peroxide (BaO 2 ) because the larger O 2 2 ion is better able to separate the large Ba 2+ ions in the crystal lattice. All group 2 elements except barium react directly with oxygen to form the simple oxide MO. Thus, the reaction becomes easier as the energy needed to form positive ions falls. The reactions of the alkaline earth metals with oxygen are less complex than those of the alkali metals. First and second ionisation energies are required to convert the metal atoms into ions with a +2 charge.Īs we go down the group, ionisation energy decreases because it gets easier to form the ions due to less attraction of electrons towards the nucleus in heavier atoms. The formation of these ions from the original metal requires input of energy. When alkaline earth metals react with water to form metal oxides or hydroxides, metal ions are formed. Alkaline earth metals become more reactive towards water as we go down the group. Magnesium and beryllium react with steam to give metal oxide and hydrogen gas. Group 2 elements react with cold water, except beryllium and magnesium, to give metal hydroxide and water. As you go down group 1 (the alkali metals) in the periodic table, the elements get more reactive. It can be used as a differentiated activity for the more able students within a group. ![]() This could be used to follow up some work on the periodic table where the trends in reactivity in groups 1 and 7 have been identified. Group 2 elements comprise beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba) and these elements are known as alkaline earth metals. Reactivity of halogens and alkali metals. Chemistry for the gifted and talented: trends in reactivity in the periodic table. As we go down the group, group 2 elements become more reactive towards water. There is a trend in the reactivity of alkaline earth metals with water. Recall the elements that constitute group 2. ![]() Hint: Group 2 elements are called alkaline earth metals.
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