The alkaline earth metals are in the second group of the periodic table. Portable and easy to use, Alkaline Earth Metals study sets help you review the information and examples you need to succeed, in the time you have available. However, all of these elements do occur naturally. Preparing for entrance exams? Sitemap | It is because of increase in atomic size due to addition of new shells and increase in the magnitude of screening effect of the electrons in inner shells. Thus, unlike alkali metals, the alkaline earth metals exhibit +2 oxidation state in their compounds. lanievanadestine. The 2nd electron in case of alkali metal is to be removed form a cation (unipostive ion) which has already acquired a noble gas configuration whereas in case of alkaline earth metals, the second electron is to be removes fro a cation which is yet to acquire the stable noble gas configuration therefore, removal of 2nd electron in case of alkaline earth metals requires much less energy than that in case of alkali metals. Present in the earth's crust but not in their basic form. Alkaline earth metals appear shiny, silvery-white and are found in the earth's crust. Ba and Mg do not impart any colour to the fame i.e. Elements of Alkaline earth metals with electron configuration Insoluble in water. Media Coverage | Alkali metals and alkaline earth metals are the “S-block” elements because elements in both of these groups have their outermost electron(s) in the s-subshell. The alkaline earth metals shows +2 oxidation state i.e. they always form divalent cations (M2+). Two electrons are present in the valency shall. decreases and electrode potentials become more and more negative with increasing atomic number from Be to Ra. Signing up with Facebook allows you to connect with friends and classmates already The elements included in the group include radium, barium, strontium, calcium, magnesium and beryllium. CaH2 is called Hydrolith and is used for production of H2 by action of water on it. number, Please choose the valid BeO is amphoteric, other oxides are basic. The name alkaline earth metals was given to magnesium, calcium, barium & strontium since their oxides were alkaline in nature and these oxide remained unaffected by heat or fire and existed in earth. Sulphates, phosphates, fluorides, chromates, oxides etc are soluble in water. Elements of Alkaline earth metals with electron configuration That means as their atomic numbers increase the furthur down they appear in the group, their reactivity increases. Question 4:  Which of the following alternatives represents on of the products of the reaction, Look here for past year papers of IIT JEE, Click here to refer syllabus of chemistry for  IIT JEE. Feedback. They are highly … The alkaline earth metals readily react with acids liberating hydrogen. BeCO3 is kept in the atmosphere of CO2 to prevent its decomposition. This means that Be is much less electropositive than other alkaline earth metals and hence does not react with water or steam even at red heat. This explains the upper limit of +2 oxidation state for the elements. Alkaline-earth metal, any of the six chemical elements that comprise Group 2 (IIa) of the periodic table. The elements in these two groups are the most reactive metals in the periodic table. These are not known in free state. Refer to the following video for flame test of alkali metals. The 2nd ionization energies of the elements of group I are higher than those of the elements of group II. Alkaline earth elements are quite reactive due to their low ionisation energies but are found to be less reactive than alkali metals because the alkaline earth metals have comparatively higher ionisation energy. Since larger cations stabilize larger anions. The alkaline earth metals are metallic elements that are found in the second vertical row of the periodic table. Subpages of this template Strong bases, highly soluble and stable towards heat. The compounds are extensively hydrated. Click the links or see below for more details on each. The reactivity increases on moving down the Group from magnesium to barium. You can call this group as group 2 element. However with in the group, the ionization energy decreases as the atomic number increases. The alkaline earth metals get their name because of their reactive properties. This is in contrast to alkali metals where only Li forms Li3N. CaCO3.2H2O obtained in pure form in 1808, calcium is derived from latin word calx, meaning “lime”. Calcium is the 20th element in the periodic table. Group 2 elements are known as Alkaline Earth Metals. The divalent cations of alkaline earth metals acquires stable inert gas configuration. Ca, Sr and Ba have more negative electrode potentials similar to those of the corresponding group I alkali metals and hence react with even with cold water, liberating H2 and forming the corresponding metal hydroxides. The word earth was applied in old days to a metallic oxide and because the oxides of calcium, strontium and barium produced alkaline solutions in water and, therefore these metals are called the alkaline earth metals. The alkaline earth metals are weaker reducing agents than the alkali metals. It includes beryllium, magnesium, calcium, strontium, barium, and radium. news feed!”. ZnS, CdS, HgS insoluble and precipitate in salt analysis. The elements included in the group include radium, barium, strontium, calcium, magnesium and beryllium. All these carbides react with water producing acetylene gas. The name alkaline earth suggest that these metals form alkalies with water and are found in earth’s crust. Weaker as ionization potential values are high and oxidation potential values are low. Calcium is the primary constituent of teeth and bones. The above documentation is transcluded from Template:Periodic table (alkaline earth metals)/doc. Like the Group 1A elements, the alkaline earth metals are too reactive to be found in nature in their elemental form. Enthalpy of hydration of M2+ ions (kJ mol-1). BaSO4 is used in medicine as a contrast medium for stomach and intestine, Isolated as chloride in 1898 from the mineral pitchblende. It is a group 2 metal, also known as an alkaline-earth metal, and no populated d-orbital electrons. Therefore the density increases from Be to Ba. They are smaller than the alkali metals of the same … 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. The heats of hydration of M2+ decreases with an increase in their ionic size and their values are greater than that of alkali metal ions. Quizlet is the easiest way to study, practice and master what you’re learning. Uses of Alkaline Earth Metals. Like alkali metal, the alkaline earth metals dissolve in liquid ammonia to give deep blue black solution from which ammoniates [ M (NH3)6 ]2+ can be recovered. 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