The melting points of the alkali metals as a group are lower than those of any other nongaseous group of the periodic table, ranging between 179 °C (354 °F) for lithium and 28.5 °C (83.3 °F) for cesium. But their melting and boiling points are higher than corresponding alkali metals in the same period due to comparatively smaller size. The highlighted elements of this periodic table belong to the alkaline earth element family. The elements belonging to the group 1 and 2 in the modern periodic table are called s-block elements. The low melting points … The highest melting and boiling points are for beryllium, which indeed has the lowest atomic number. The melting point of a substance is the temperature at which this phase change occurs. In chemical terms, all of the alkaline earth metals react with the halogens to form the alkaline earth metal halides, all of which are ionic crystalline compounds (except for beryllium chloride, which is … These elements are metals. The melting point also defines a condition in which the solid and liquid can exist in equilibrium. Among the alkaline earth metals except for magnesium, the melting and boiling points decrease regularly from beryllium to barium. The alkaline earth metals have higher melting and boiling points as compared to those of alkali metals mainly attributed to their small size and more closely packed crystal lattice as compared to alkali metals and presence of two valence electrons. The alkaline earth metals are therefore less reactive than the alkali metals (Be and Mg are the least reactive of the alkaline earth metals). 5.2 Alkali metals: The alkaline earth metals have higher melting and boiling points as compared to those of alkali metals which is attributed to their small size and more close packed crystal lattice as compared to alkali metals and presence of two valence electrons. Group II metals have more nucleons, therefore more mass than Group I metals. Chemical Properties of Alkaline Earth Metals The key features of the compounds of alkaline earth metals and their general characteristics are discussed in this subsection. In this unit, we study their properties, uses, important compounds and biological importance. Melting Point of Chemical Elements. (b) Melting and boiling point : The fairly higher melting and boiling points of the alkaline earth metal compared to these of the corresponding alkali metal are attributed to their smaller sizes and two valence … Examples include calcium and magnesium. The first ionization energies (\(I_1\)) of the alkaline earth metals are not as low as the alkali metals. Melting and boiling points of alkaline earth metals Alkaline earth metals (Be, Mg, Ca, Sr, Ba, Ra) have low melting and boiling points when compared with d block metals. Several physical properties of these elements are compared in Table \(\PageIndex{2}\). Among the metallic elements, only mercury has a lower melting point (−38.9 °C, or −38.02 °F) than cesium. Group II (alkaline earth) metals have a higher density because they have more protons and neutrons and they have smaller atomic radius. The elements belonging to these two groups are commonly known as alkali and alkaline earth metals respectively. It melts at 2,348.6 ° F (1,287 ° C), and boils at 4,789.8 ° F (2,471 ° C). Adding a heat will … The alkaline earth metals or simply alkaline earths are recognized as an important group and family of elements. Alkaline-Earth Metals Harder, Denser, Stronger than the alkali metals, with higher melting points. Melting and Boiling Points. Soft and Shiny; reacts violently with water; can be cut with a butter knife; never found uncombined with other elements. Order: Ca < Mg < Be < Sr < Ba. Todd Helmenstine. In general, melting is a phase change of a substance from the solid to the liquid phase. 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