CaO2 is not formed this way but can be prepared as the hydrate by treating Ca (OH)2 with H2O2and then dehydrating the product. Register and Get connected with IITian Chemistry faculty, Please choose a valid This group lies in the s-block of the periodic table. Terms & Conditions |
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Alkaline earth material is any element that you can find in the second column of the periodic table for example: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), radium (Ra). The alkaline earth metals are in the second group of the periodic table. Thus, beryllium is the least reactive while Ba (or Ra) is the most reactive element. All the alkaline earth metals have two electrons in their valence shell, so they lose two electrons to form cations with a 2+ charge. The elements in group 2 (the second column) form compounds consisting of one atom of the element and two atoms of hydrogen: These are called alkaline earth metals, with similar properties among members of that group. The alkaline earth metals have fairly low ionization enthalpies though greater than those of the corresponding elements of group 1 and this value decreases down the group. The reactivity towards oxygen increases as we go down the group. Solubility of hydroxides increases as we move down the group. However, the reaction of alkaline earth metals is less vigorous as compared to alkali metals. Similarly, all the alkaline earth metals react with the heavier group 15 elements to form binary compounds such as phosphides and arsenides with the general formula M 3 Z 2. Also browse for more study materials on Chemistry here. Created by. Exist only in solution. Pay Now |
centre – two electron (3C - 2e) bonds as shown below: The hydrides of other elements of this group i.e. More than 50 million students study for free with the Quizlet app each month. Alkaline earth metals appear shiny, silvery-white and are found in the earth's crust. If you've found a bug or have suggestions as to how we can improve this website please get in touch. The alkaline earth metals have two valence electrons in their highest-energy orbitals (ns 2). If ionization energy were the only factor involved, than group II elements should have formed monovalent ions i.e. How does the basicity of oxides of group 2 increases down the group? Reactivity of alkaline earth metals increases as we move down the group. There is sharp increase in third ionization energy due to stable inert gas configuration of m+2 ions. The general electron configuration of alkaline metals is [noble gas] ns 2 where n represents the valence shell. They are called earth metals because their compounds were first found in plant remains in soil. 1) It is used in the manufacture of alloys. Soluble in water. This is due to the reason that the alkaline earth metals have greater tendency to lose electrons so, they act as reducing agent but since their I.E. All the hydrides of alkaline earth metals reacts with water liberating H2 gas and thus act as reducing agents. Do not decompose on heating (LiCO3 is an exception), Directly combine with nitrogen and form nitrides, Do not directly combine with nitrogen except lithium, Directly combine with carbon and form carbides, Decompose on heating evolving a mixture of NO2 and oxygen, Decompose on heating evolving only oxygen, Sulphates, phosphates fluorides, chromates, oxalates etc are insoluble in water. Refer to the following video for flame test of alkali metals. Calcium is the fifth most abundant element by mass (3.4%) in both the Earth's crust and in seawater. 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