chemical reactivity of alkaline earth metals
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(1) The alkali metals and alkaline earth metals are very reactive due to their low ionisation enthalpy. As a result they are always found in combined state.
(2) Alkali metals due to their large atomic raii and low ionisation enthalpy form univalent positiveions M^+ easily. Therefore, they are more reactive than alkaline earth metals.
(3) Alkaline earth metals form bivalent positive ions M^2^+ The reactivity of these metal, increases down the group as the ionisation enthalpy decreases in a group
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